<PAGE>

                                                                    EXHIBIT 10.6

                            INDEMNIFICATION AGREEMENT

         This Agreement is made as of the 1st day of February 2002, by and
between CMGI, Inc., a Delaware corporation (collectively with its direct and
indirect majority owned subsidiaries, the "Corporation"), and James Barnett
("Indemnitee"), a director or officer of the Corporation.

         WHEREAS, it is essential to the Corporation to retain and attract as
directors and officers the most capable persons available, and

         WHEREAS, the substantial increase in corporate litigation subjects
directors and officers to expensive litigation risks, and

         WHEREAS, the Corporation has adopted an Article in its Restated
Certificate of Incorporation (the "Charter") and a By-Law providing for the
indemnification of Officers and Directors of the Corporation as authorized by
Section 45 of the Delaware General Corporation Law, and

         WHEREAS, Indemnitee has indicated that he does not regard the
protection available under the Corporation's Charter and insurance as adequate
in the present circumstances, and may not be willing to serve or continue to
serve as a director or officer without adequate protection, and

         WHEREAS, the Corporation desires Indemnitee to serve, or continue to
serve, as a director or officer of the Corporation.

         NOW THEREFORE, the Corporation and Indemnitee do hereby agree as
follows:

         1.  Agreement to Serve. Indemnitee agrees to serve or continue to serve
as a director or officer of the Corporation for so long as Indemnitee is duly
elected or appointed or until such time as Indemnitee tenders Indemnitee's
resignation or Indemnitee's status as a director or officer is terminated.

         2.  Definitions. As used in this Agreement:

             (a)  The term "Proceeding" shall include any threatened, pending or
completed action, suit, arbitration, alternative dispute resolution proceeding,
administrative hearing or other proceeding, whether brought by or in the right
of the Corporation or otherwise and whether of a civil, criminal, administrative
or investigative nature, and any appeal therefrom.

             (b)  The term "Corporate Status" shall mean the status of a person
who is or was a director or officer of the Corporation, or is or was serving, or
has agreed to serve, at the request of the Corporation, as a director, officer,
partner, trustee, member, employee or agent of a subsidiary of the Corporation
or another corporation, partnership, joint venture, trust, limited liability
company or other enterprise.

<PAGE>

         (c)  The term "Expenses" shall include, without limitation, reasonable
attorneys' fees, retainers, court costs, transcript costs, fees and expenses of
experts, travel expenses, duplicating costs, printing and binding costs,
telephone charges, postage, delivery service fees and other disbursements or
expenses of the types customarily incurred in connection with investigations,
judicial or administrative proceedings or appeals, but shall not include the
amount of judgments, fines or penalties against Indemnitee or amounts paid in
settlement in connection with such matters.

         (d)  References to "other enterprise" shall include employee benefit
plans; references to "fines" shall include any excise tax assessed with respect
to any employee benefit plan; references to "serving at the request of the
Corporation" shall include any service as a director, officer, employee or agent
of the Corporation which imposes duties on, or involves services by, such
director, officer, employee, or agent with respect to an employee benefit plan,
its participants, or beneficiaries; and a person who acted in good faith and in
a manner such person reasonably believed to be in the interests of the
participants and beneficiaries of an employee benefit plan shall be deemed to
have acted in a manner "not opposed to the best interests of the Corporation" as
referred to in this Agreement.

         (e)  The term "Change of Control" shall mean the consummation of any of
the following events: (i) a sale, lease or disposition of all or substantially
all of the assets of the Corporation or a subsidiary of which Indemnitee is an
officer, or (ii) a merger or consolidation (in a single transaction or a series
of related transactions) of the Corporation or a subsidiary of which Indemnitee
is an officer with or into any other corporation or corporations or other
entity, or any corporate reorganization, where the stockholders of the
Corporation or a subsidiary of which Indemnitee is an officer immediately prior
to such event do not retain (in substantially the same percentages) beneficial
ownership, directly or indirectly, of more than fifty percent (50%) of the
voting power of and interest in the successor entity or the entity that controls
the successor entity.

     3.  Indemnification in Third-Party Proceedings. The Corporation shall
indemnify Indemnitee in accordance with the provisions of this Paragraph 3 if
Indemnitee was or is a party to or threatened to be made a party to or otherwise
involved in any Proceeding (other than a Proceeding by or in the right of the
Corporation to procure a judgment in its favor) by reason of the Indemnitee's
Corporate Status or by reason of any action alleged to have been taken or
omitted in connection therewith, against all Expenses, judgments, fines,
penalties, liabilities or losses and, to the extent permitted by law, amounts
paid or to be paid in settlement actually and reasonably incurred by Indemnitee
or on his behalf in connection with such Proceeding, if Indemnitee acted in good
faith and in a manner which Indemnitee reasonably believed to be in, or not
opposed to, the best interests of the Corporation and, with respect to of any
criminal Proceeding, had no reasonable cause to believe that his conduct was
unlawful. The termination of any Proceeding by judgment, order, settlement,
conviction or upon a plea of nolo contendere or its equivalent, shall not, of
itself, create a presumption that Indemnitee did not act in good faith and in a
manner which the Indemnitee reasonably believed to be in, or not opposed to, the
best interests of the Corporation, and, with respect to any criminal Proceeding,
had reasonable cause to believe that his conduct was unlawful.

<PAGE>

     4.  Indemnification in Proceedings by or in the Right of the Corporation.
The Corporation shall indemnify Indemnitee in accordance with the provisions of
this Paragraph 4 if Indemnitee was or is a party to or threatened to be made a
party to or otherwise involved in any Proceeding by or in the right of the
Corporation to procure a judgment in its favor by reason of the Indemnitee's
Corporate Status or by reason of any action alleged to have been taken or
omitted in connection therewith, against all Expenses, judgments, fines,
penalties, liabilities or losses and, to the extent permitted by law, amounts
paid or to be paid in settlement actually and reasonably incurred by Indemnitee
or on his behalf in connection with such Proceeding, if Indemnitee acted in good
faith and in a manner which Indemnitee reasonably believed to be in, or not
opposed to, the best interests of the Corporation, except that no
indemnification shall be made under this Paragraph 4 in respect of any claim,
issue, or matter as to which Indemnitee shall have been adjudged to be liable to
the Corporation, unless and only to the extent that the Court of Chancery of
Delaware or the court in which such action or suit was brought shall determine
upon application that, despite the adjudication of such liability but in view of
all the circumstances of the case, Indemnitee is fairly and reasonably entitled
to indemnity for such Expenses as the Court of Chancery or such other court
shall deem proper. The termination of any Proceeding by judgment, order,
settlement, conviction or upon a plea of nolo contendere or its equivalent,
shall not, of itself, create a presumption that Indemnitee did not act in good
faith and in a manner which the Indemnitee reasonably believed to be in, or not
opposed to, the best interests of the Corporation, and, with respect to any
criminal Proceeding, had reasonable cause to believe that his conduct was
unlawful.

     5.  Exceptions to Right of Indemnification. Notwithstanding anything to the
contrary in this Agreement, except as set forth in Paragraph 10, the Corporation
shall not indemnify the Indemnitee in connection with a Proceeding (or part
thereof) initiated by the Indemnitee unless the initiation thereof was approved
by the Board of Directors of the Corporation. Notwithstanding anything to the
contrary in this Agreement, the Corporation shall not indemnify the Indemnitee
to the extent the Indemnitee is reimbursed from the proceeds of insurance, and
in the event the Corporation makes any indemnification payments to the
Indemnitee and the Indemnitee is subsequently reimbursed from the proceeds of
insurance, the Indemnitee shall promptly refund such indemnification payments to
the Corporation to the extent of such insurance reimbursement.

     6.  Indemnification of Expenses of Successful Party. Notwithstanding any
other provision of this Agreement, to the extent that Indemnitee has been
successful, on the merits or otherwise, in defense of any Proceeding or in
defense of any claim, issue or matter therein, Indemnitee shall be indemnified
against all Expenses incurred by him or on his behalf in connection therewith.
Without limiting the foregoing, if any Proceeding or any claim, issue or matter
therein is disposed of, on the merits or otherwise (including a disposition
without prejudice), without (i) the disposition being adverse to the Indemnitee,
(ii) an adjudication that the Indemnitee was liable to the Corporation, (iii) a
plea of guilty or nolo contendere by the Indemnitee, (iv) an adjudication that
the Indemnitee did not act in good faith and in a manner he reasonably believed
to be in or not opposed to the best interests of the Corporation, and (v) with
respect to any criminal proceeding, an adjudication that the Indemnitee had
reasonable cause to believe his conduct was unlawful, the Indemnitee shall be
considered for the purposes hereof to have been wholly successful with respect
thereto.

<PAGE>

     7.  Notification and Defense of Claim. As a condition precedent to his
right to be indemnified, the Indemnitee must notify the Corporation in writing
as soon as practicable of any Proceeding for which indemnity will or could be
sought by him and provide the Corporation with a copy of any summons, citation,
subpoena, complaint, indictment, information or other document relating to such
Proceeding with which he is served. With respect to any Proceeding of which the
Corporation is so notified, the Corporation will be entitled to participate
therein at its own expense and/or to assume the defense thereof at its own
expense, with legal counsel reasonably acceptable to the Indemnitee. After
notice from the Corporation to the Indemnitee of its election so to assume such
defense, the Corporation shall not be liable to the Indemnitee for any legal or
other expenses subsequently incurred by the Indemnitee in connection with such
claim, other than as provided below in this Paragraph 7. The Indemnitee shall
have the right to employ his own counsel in connection with such claim, but the
fees and expenses of such counsel incurred after notice from the Corporation of
its assumption of the defense thereof shall be at the expense of the Indemnitee
unless (i) the employment of counsel by the Indemnitee has been authorized by
the Corporation, (ii) counsel to the Indemnitee shall have reasonably concluded
that there may be a conflict of interest or position on any significant issue
between the Corporation and the Indemnitee in the conduct of the defense of such
action or (iii) the Corporation shall not in fact have employed counsel to
assume the defense of such action, in each of which cases the fees and expenses
of counsel for the Indemnitee shall be at the expense of the Corporation, except
as otherwise expressly provided by this Agreement. The Corporation shall not be
entitled, without the consent of the Indemnitee, to assume the defense of any
claim brought by or in the right of the Corporation or as to which counsel for
the Indemnitee shall have reasonably made the conclusion provided for in clause
(ii) above. The Corporation shall not be required to indemnify the Indemnitee
under this Agreement for any amounts paid in settlement of any Proceeding
effected without its written consent. The Corporation shall not settle any
Proceeding in any manner which would impose any penalty or limitation on
Indemnitee without Indemnitee's written consent. Neither the Corporation nor the
Indemnitee will unreasonably withhold their consent to any proposed settlement.

     8.  Advancement of Expenses. Subject to the provisions of Paragraph 9
below, in the event that the Corporation does not assume the defense pursuant to
Paragraph 7 of this Agreement of any Proceeding to which the Indemnitee was or
is a party or is threatened to be made a party by reason of his Corporate Status
or by reason of any action alleged to have been taken or omitted in connection
therewith and of which the Corporation receives notice under this Agreement, any
Expenses incurred by the Indemnitee or on his behalf in defending such
Proceeding shall be paid by the Corporation in advance of the final disposition
of such Proceeding; provided, however, that the payment of such Expenses
incurred by the Indemnitee or on his behalf in advance of the final disposition
of such Proceeding shall be made only upon receipt of an undertaking by or on
behalf of the Indemnitee to repay all amounts so advanced in the event that it
shall ultimately be determined that the Indemnitee is not entitled to be
indemnified by the Corporation as authorized in this Agreement. Such undertaking
shall be accepted without reference to the financial ability of the Indemnitee
to make repayment.

     9.  Procedure for Indemnification. In order to obtain indemnification or
advancement of Expenses pursuant to Paragraphs 3, 4, 6 or 8 of this Agreement,
Indemnitee shall submit to the Corporation a written request, including in such
request such documentation and information as is reasonably available to
Indemnitee and is reasonably necessary to determine

<PAGE>

whether and to what extent Indemnitee is entitled to indemnification or
advancement of Expenses. Any such indemnification or advancement of Expenses
shall be made promptly, and in any event within 30 days after receipt by the
Corporation of the written request of the Indemnitee, unless with respect to
requests under Paragraphs 3, 4 or 8 the Corporation determines within such
30-day period that such Indemnitee did not meet the applicable standard of
conduct for indemnification set forth in Paragraph 3 or 4, as the case may be.
The Board of Directors of the Corporation shall either (a) approve the
indemnification and advancement of Expenses (i) by a majority vote of the
Directors of the Corporation consisting of persons who are not at that time
parties to the Proceeding ("Disinterested Directors"), whether or not a quorum;
or (ii) by a committee of Disinterested Directors designated by a majority vote
of Disinterested Directors, whether or not a quorum; or (b) designate
independent legal counsel (appointed by the Corporation and approved by
Indemnitee) who shall, within said 30-day period, provide a written opinion to
the Board as to whether Indemnitee has met the relevant standards of conduct for
indemnification and advancement of Expenses. The obligations of the Corporation
hereunder with respect to the payment of any Expenses, judgment, fine or penalty
shall be subject to the condition that the independent legal counsel shall not
have determined (in a written opinion) that Indemnitee is not permitted to be
indemnified under the applicable standards of conduct for indemnification.

     The obligation of the Corporation regarding the advancement of Expenses
pursuant to this Agreement shall be subject to the condition that, if, when and
to the extent that the independent legal counsel determines that Indemnitee is
not permitted to be so indemnified, the Corporation shall be entitled to be
reimbursed by Indemnitee (who hereby agrees to reimburse the Corporation) for
all such amounts theretofore paid. If Indemnitee has commenced legal proceedings
(either before or after the determination by independent legal counsel) in a
court of competent jurisdiction to secure a determination that Indemnitee may be
indemnified under this Agreement or otherwise, any determination made by the
independent legal counsel that Indemnitee is not permitted to be indemnified
shall not be binding, and Indemnitee shall not be required to reimburse the
Corporation for any advancement of Expenses and shall continue to be entitled to
the advancement of Expenses until a final judicial determination is made with
respect thereto (as to which all rights of appeal therefrom have been exhausted
or lapsed). If there has been no determination by the independent legal counsel
or if the independent legal counsel determines that Indemnitee is not permitted
to be indemnified in whole or in part, Indemnitee shall have the right to
commence litigation in any court in the states of California or Delaware having
subject matter jurisdiction thereof and in which venue is proper seeking an
initial determination by the court or challenging any such determination by the
independent legal counsel or any aspect thereof, and the Corporation hereby
consents to service of process and to appear in any such proceeding.

     10. Remedies. The right to indemnification or advancement of Expenses as
provided by this Agreement shall be enforceable by the Indemnitee in any court
of competent jurisdiction if the Corporation denies such request, in whole or in
part, or if no disposition thereof is made within the 30-day period referred to
above in Paragraph 9. Unless otherwise required by law, the burden of proving
that indemnification is not appropriate shall be on the Corporation. Neither the
failure of the Corporation to have made a determination prior to the
commencement of such action that indemnification is proper in the circumstances
because Indemnitee has met the applicable standard of conduct, nor an actual
determination by the Corporation pursuant to

<PAGE>

Paragraph 9 that Indemnitee has not met such applicable standard of conduct,
shall be a defense to the action or create a presumption that Indemnitee has not
met the applicable standard of conduct. Indemnitee's expenses (of the type
described in the definition of "Expenses" in Paragraph 2(c)) reasonably incurred
in connection with successfully establishing his right to indemnification, in
whole or in part, in any such Proceeding shall also be indemnified by the
Corporation.

     11. Partial Indemnification. If Indemnitee is entitled under any provision
of this Agreement to indemnification by the Corporation for some or a portion of
the Expenses, judgments, fines, penalties or amounts paid in settlement actually
and reasonably incurred by him or on his behalf in connection with any
Proceeding but not, however, for the total amount thereof, the Corporation shall
nevertheless indemnify Indemnitee for the portion of such Expenses, judgments,
fines, penalties or amounts paid in settlement to which Indemnitee is entitled.

     12. Subrogation. In the event of any payment under this Agreement, the
Corporation shall be subrogated to the extent of such payment to all of the
rights of recovery of Indemnitee, who shall execute all papers required and take
all action necessary to secure such rights, including execution of such
documents as are reasonably necessary to enable the Corporation to bring suit to
enforce such rights.

     13. Term of Agreement. The Corporation's agreements and obligations under
this Agreement shall continue during the period Indemnitee is a director or
officer of the Corporation, and shall continue thereafter so long as Indemnitee
shall be subject to any possible claim or proceeding by reason of Indemnitee's
service in such capacity. The Indemnitee's rights under this Agreement shall
inure to the benefit of Indemnitee's heirs, executors and administrators.

     14. Officer and Director Liability Insurance. In the event the
Corporation's Directors and Officers Insurance terminates or the scope or amount
of coverage of the Corporation's Directors and Officers Insurance be reduced
from the scope and coverage in effect during the first year of the Agreement,
the Corporation agrees to give Indemnitee prompt notice thereof and to hold
harmless and indemnify the Indemnitee to the fullest extent permitted pursuant
to this Agreement and/or by applicable law to the full extent of the coverage
that is in effect during the first year of this Agreement. Notwithstanding the
foregoing, the Corporation is not obligated to maintain any Directors and
Officers Insurance.

     15. Section 16(b) Liability. The Corporation shall not be liable under this
Agreement to make any payment in connection with any claim made against
Indemnitee for an accounting of profits made from the purchase or sale by
Indemnitee of securities of the Corporation within the meaning of Section 16(b)
of the Securities and Exchange Act of 1934 and amendments thereto or similar
provisions of any state statutory law or common law.

     16. Indemnification Hereunder Not Exclusive. The indemnification and
advancement of Expenses provided by this Agreement shall not be deemed exclusive
of any other rights to which Indemnitee may be entitled under the Charter, the
By-Laws, any agreement, any vote of stockholders or disinterested directors, the
General Corporation Law of Delaware, any other law

<PAGE>

(common or statutory), or otherwise, both as to action in his official capacity
and as to action in another capacity while holding office for the Corporation.
Nothing contained in this Agreement shall be deemed to prohibit the Corporation
from purchasing and maintaining insurance, at its expense, to protect itself or
the Indemnitee against any expense, liability or loss incurred by it or him in
any such capacity, or arising out of his status as such, whether or not the
Indemnitee would be indemnified against such expense, liability or loss under
this Agreement; provided that the Corporation shall not be liable under this
Agreement to make any payment of amounts otherwise indemnifiable hereunder if
and to the extent that Indemnitee has otherwise actually received such payment
under any insurance policy (whether arising from an insurance policy provided to
the Corporation, a subsidiary, a parent, or any other insurance policy),
contract, agreement or otherwise.

     17. Attorneys' Fees. In the event that Indemnitee institutes any legal
action to enforce Indemnitee's legal rights hereunder, or to recover damages for
breach of this Agreement, Indemnitee, if Indemnitee prevails in whole or in
part, shall be entitled to recover from the Corporation reasonable attorneys'
fees and disbursements incurred by Indemnitee with respect to the claims or
matters on which Indemnitee has prevailed.

     18. Merger, Consolidation, or Change of Control. In the event that the
Corporation or a subsidiary of which Indemnitee is an officer shall be a
constituent corporation in a consolidation or merger, whether the Corporation or
a subsidiary of which Indemnitee is an officer is the resulting or surviving
corporation or is absorbed, or if there is a Change of Control, Indemnitee shall
stand in the same position under this Agreement as Indemnitee would have with
respect to the Corporation or a subsidiary of which Indemnitee is an officer if
its separate existence had continued or if there had been no Change of Control.

     19. No Special Rights. Nothing herein shall confer upon Indemnitee any
right to continue to serve as an officer or director of the Corporation for any
period of time or at any particular rate of compensation.

     20. Savings Clause. If this Agreement or any portion thereof shall be
invalidated on any ground by any court of competent jurisdiction, then the
Corporation shall nevertheless indemnify Indemnitee as to Expenses, judgments,
fines, penalties and amounts paid in settlement with respect to any Proceeding
to the full extent permitted by any applicable portion of this Agreement that
shall not have been invalidated and to the fullest extent permitted by
applicable law.

     21. Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall constitute the original.

     22. Successors and Assigns. This Agreement shall be binding upon the
Corporation and its successors and assigns and shall inure to the benefit of the
estate, heirs, executors, administrators and personal representatives of
Indemnitee.

     23. Headings. The headings of the paragraphs of this Agreement are inserted
for convenience only and shall not be deemed to constitute part of this
Agreement or to affect the construction thereof.

<PAGE>

     24. Modification and Waiver. This Agreement may be amended from time to
time to reflect changes in Delaware law or for other reasons. No supplement,
modification or amendment of this Agreement shall be binding unless executed in
writing by both of the parties hereto. No waiver of any of the provisions of
this Agreement shall be deemed or shall constitute a waiver of any other
provision hereof nor shall any such waiver constitute a continuing waiver.

     25. Notices. All notices, requests, demands and other communications
hereunder shall be in writing and shall be deemed to have been given (i) when
delivered by hand or (ii) if mailed by certified or registered mail with postage
prepaid, on the third day after the date on which it is so mailed:

         (a)   if to the Indemnitee, to:



               James Barnett
               232 Polhemus Avenue
               Atherton, CA 94027
               if to the Corporation, to:

               CMGI, Inc.
               100 Brickstone Square
               Andover, MA  01810
               Attention:  General Counsel or Chief Executive Officer

or to such other address as may have been furnished to Indemnitee by the
Corporation or to the Corporation by Indemnitee, as the case may be.

     26. Applicable Law. This Agreement shall be governed by, and construed and
enforced in accordance with, the laws of the State of Delaware.

     27. Enforcement. The Corporation expressly confirms and agrees that it has
entered into this Agreement in order to induce Indemnitee to continue to serve
as a director of the Corporation, and acknowledges that Indemnitee is relying
upon this Agreement in continuing in such capacity.

     28. Entire Agreement. This Agreement sets forth the entire agreement of the
parties hereto in respect of the subject matter contained herein and supercedes
all prior agreements, whether oral or written, by any officer, employee or
representative of any party hereto in respect of the subject matter contained
herein; and any prior agreement of the parties hereto in respect of the subject
matter contained herein is hereby terminated and cancelled. For avoidance of
doubt, the parties confirm that the foregoing does not apply to or limit the
Indemnitee's rights under Delaware law or the Corporation's Charter or bylaws.

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed as of the day and year first above written.

CMGI, INC.                                 INDEMNITEE:

By:     /s/ David Andonian                 By:    /s/ James Barnett

Name:   David Andonian                     Name:  James Barnett

Title:  President and Chief Executive      Title: Chief Executive Officer of
        Officer                                   AltaVista Company