<PAGE>

                                                                   EXHIBIT 10.21

                             EMPLOYMENT AGREEMENT

     This Employment Agreement (the "Agreement") is dated as of September 29,
2000, by and among Kevin Berk (the "Employee"), Zeal Media, Inc., a California
corporation (the "Company") and LookSmart, Ltd., a Delaware corporation
("Parent").

                                   RECITALS

     WHEREAS, the Employee is presently employed by the Company;

     WHEREAS, the Company has entered into an Agreement and Plan of Merger,
dated as of September 28, 2000 (the "Merger Agreement"), with Parent and LS
Acquisition, Inc., a Delaware corporation and a wholly-owned subsidiary of
Parent ("Sub"), pursuant to which Sub will be merged with and into the Company,
with the Company continuing as the surviving corporation (the "Merger"); and

     WHEREAS, in connection with the Merger, the parties desire to provide for
this Agreement, effective upon the consummation of the Merger;

     NOW, THEREFORE, in consideration of the mutual covenants herein contained,
and in consideration of the continuing employment of the Employee by the Parent,
the parties agree as follows:

     1.  Effectiveness of Agreement; Duties and Scope of Employment.
         ----------------------------------------------------------

         (a) Effectiveness of Agreement.  This Agreement shall become effective
             --------------------------
as of the Effective Time (as defined in the Merger Agreement).  In the event
that the Merger is not consummated, this Agreement shall be null and void.

         (b) Position.  The Parent shall employ the Employee in the position of
             --------
Vice-President - Communities, as such position was defined in terms of
responsibilities as of the effective date of this Agreement; provided, however,
                                                             -----------------
that the Board of Directors of the Parent (the "Board of Directors") shall have
the right to revise such responsibilities from time to time as the Board of
Directors may deem necessary or appropriate but that it may not change the
Employee's title set forth above without the prior written consent of the
Employee. The Employee shall devote his full business efforts and time to the
Parent, provided, however, that the Employee may undertake reasonable
commitments to unrelated and unaffiliated companies as an angel investor and
advisor.  In no event shall these undertakings as an angel investor and advisor
interfere with the Employee's fulfillment of his obligations to the Parent.  The
Employee shall disclose to the Parent the identity and extent of any such
commitments within thirty (30) days of undertaking them.  Nothing herein shall
be construed as an exception to the non-competition obligations of the Employee
as set forth in the separate Noncompetition Agreement between the Employee and
the Parent.

                                       1-
<PAGE>

     2.  Base Compensation.  The Parent shall pay the Employee as compensation
         -----------------
for his services during his employment under this Agreement a base salary equal
to $40,000 USD per annum.  The Employee's salary will change on the following
schedule:
     04/01/01    $80,000 USD per annum
     10/01/01    $140,000 USD per annum
     Such salary shall be reviewed at least annually thereafter and shall be
adjusted from time to time in the discretion of the Board of Directors, but the
Board of Directors may not decrease such base salary.  Such salary shall be paid
in accordance with normal Parent payroll practices.  The annual compensation
specified in this Section 2, as adjusted by the Board of Directors from time to
time, is referred to in this Agreement as "Base Compensation".

     3.  Benefits; Bonus.
         ---------------

         (a) Employee Benefits.  The Employee shall be eligible to participate
             -----------------
during his employment under this Agreement in the employee benefit plans and
compensation programs maintained by Parent applicable to other similarly
situated employees of Parent, including (without limitation) savings or profit-
sharing plans, deferred compensation plans, incentive or other bonus plans,
life, disability, health, accident and other insurance programs, paid vacations,
and similar plans or programs, subject in each case to the generally applicable
terms and conditions of the plan or program in question and to the determination
of any committee administering such plan or program.

         (b)  Signing Bonus. The Employee will receive a signing bonus of
              -------------
$80,000 USD to be paid 30 days after the Effective Time. If the Employee
voluntarily resigns without Good Reason (as defined herein), the Employee will
repay the signing bonus on a pro-rata basis, such that the Employee shall repay
an amount equal to 1/36 of the bonus amount for each full or partial month
remaining between the date the Employee terminates employment and the thirty-six
(36) month anniversary of the Effective Time.

         (c) Stock Options. Parent will grant the Employee 25,000 stock
             -------------
options pursuant to its Amended and Restated 1998 Stock Plan which will be fully
vested twelve (12) months from the Effective Time.

         (d) Relocation Benefits.   The Employee will receive relocation
             --------------------
benefits in an amount consistent with the Parent's policies on relocation
benefits for a similarly situated employee (the "Relocation Benefits").  If the
Employee resigns without Good Reason (as defined herein), the Employee will
repay the Relocation Benefits on a pro-rata basis, such that the Employee shall
repay an amount equal to 1/24 of the Relocation Benefits amount for each full or
partial month remaining between the date the Employee terminates employment and
the twenty-fourth (24th) month anniversary of the Effective Time.  The Employee
will be relocated to San Francisco, California by December 1, 2000.

     4. "At-Will" Employment.  The Employee's employment under this Agreement
        --------------------
shall commence as of the Effective Time and shall terminate on the termination
of the Employee's

                                       2-
<PAGE>

employment pursuant to this Agreement. The Parent and the Employee acknowledge
that the Employee's employment is "at will," which means that the Employee may
be terminated at any time for any reason with or without Cause (as defined
below) by either the Parent or the Employee. If the Employee's employment
terminates for any reason, the Employee shall not be entitled to any payments,
benefits, damages, awards or compensation other than: (i) those provided in
Section 5 of this Agreement; (ii) those made available to the Employee in
accordance with the Parent's established employee plans and policies at the time
of termination; and (iii) those provided in the Merger Agreement and related
documents, including but not limited to the Founder's Escrow Agreement; and (iv)
those provided in any stock grant or option agreement to which the Employee is a
party or beneficiary.

     5.   Termination of Employment.
          -------------------------

          (a)  Termination without Cause; Severance.  If the Employee's
               ------------------------------------
employment with the Parent terminates at any time during the three years
following the Effective Time of the Merger, other than (i) by voluntary
resignation, (ii) for Cause (as defined below) or (iii) as a result of the
Employee's death or Disability (as defined below), then the Employee shall be
entitled to receive (A) severance pay in an amount determined in accordance with
this Section 5(a), and (B) all of his or her accrued wages and paid time off,
payable in a lump sum at the time of or prior to the Termination Date (as
defined below).  Any severance payment to which the Employee is entitled
pursuant to this Section 5 shall be payable on the Termination Date.  If
termination pursuant to this Section 5(a) occurs, the Employee will be paid an
amount equal to 12 months of the Base Compensation being paid to the Employee at
the time of termination plus a pro-rated amount of the annual bonus the Employee
would have received during the year in which the Employee's employment
terminates under any bonus plan for which he is eligible and which is in effect
at the time of termination.

Nothing herein shall be construed as affecting Employee's right to receive any
payments, benefits and compensation rightfully owed to Employee under (i) the
Merger Agreement and related documents, including without limitation the
Founder's Escrow Agreement, (ii) those provided in any stock grant or option
agreement to which the Employee is a party or beneficiary, or (iii) those made
available to the Employee in accordance with the Parent's established employee
plans and policies at the time of termination.

          (b)  Termination For Cause; Voluntary Termination.  If the Employee is
               --------------------------------------------
terminated for Cause (as defined below) or if the Employee voluntarily resigns,
then the Employee shall not be entitled to receive severance pay or other
benefits except for those (if any) as may then be established under Parent's
then existing severance and benefits plans and policies at the time of such
termination and the Employee shall only be entitled to the compensation,
benefits and reimbursement earned for the period preceding the effective date of
the termination.  For the purposes of this Section 5(b), the Employee's
resignation will not be considered voluntary if it is for Good Reason (as
defined below).

          (c)  Disability; Death.  If the Parent terminates the Employee's
               -----------------
employment as a result of the Employee's Disability (as defined below), or the
Employee's employment is terminated due to the death of the Employee, then the
Employee shall not be entitled to receive severance or other benefits

                                       3-
<PAGE>

except for those (if any) as may then be established under the Parent's then
existing severance and benefits plans and policies at the time of such
Disability or death.

                                       4-
<PAGE>

     6.   Definition of Terms.  The following terms referred to in this
          -------------------
Agreement shall have the following meanings:

          (a)    Cause.  "Cause" shall mean one or more of the following:
                 -----
               (1)  The Employee's continued failure to perform his or her
                    duties and responsibilities in good faith and to the best of
                    his or her ability;

               (2)  The Employee personally engaging in fraud;

               (3)  The Employee being convicted of, or pleading nolo contendere
                    to, a felony;

               (4)  The Employee breaching this Agreement or any other agreement
                    (including any non-competition agreement) with Parent or any
                    subsidiary in which Parent has a majority ownership
                    interest;

               (5)  The Employee's commencement of employment with another
                    employer while he or she is an employee of Parent or any
                    subsidiary in which Parent has a majority ownership
                    interest, without Parent's prior written consent;

               (6)  The Employee's continued material noncompliance with the
                    human resources policies of Parent delivered or made
                    available to the Employee;

               (7)  Employee's continued material non-conformance with a
                    standard business practice and policy generally known by the
                    Parent's employees, made known or made available to the
                    Employee or delivered in writing to the Employee;

               (8)  Termination or loss, through no fault or derogation of duty
                    on the part of the Parent, of the Employee's employment
                    authorization from the U.S. Immigration and Naturalization
                    Service or the U.S. Department of State reflecting a right
                    to work in the United States.


If the Employee has engaged in the acts described in subparagraphs (1), (4), (6)
or (7) above and if, in the reasonable judgment of the Parent, such action is
capable of being cured, the Employee shall not be terminated unless the Employee
is furnished with a thirty (30) day advance notice of the Parent's intention to
terminate the Employee for such action, and the Employee fails to cure.

          (b) Disability.  "Disability" shall mean that the Employee is unable
              ----------
to fulfill his responsibilities as an Employee due to illness or accident for
ninety (90) consecutive working days with such termination effective after the
notice period set forth in Section 6(d)(i) below.

          (c) Good Reason.  "Good Reason" shall mean the Employee's resignation
              -----------
following the Parent's violation of a material provision of this Agreement or
the Employee's resignation following a substantial diminution in the duties and
responsibilities assigned to the Employee.

                                       5-
<PAGE>

          (d) Termination Date.  "Termination Date" shall mean (i) if this
              ----------------
Agreement is terminated by the Parent for Disability, thirty (30) days after
notice of termination is given to the Employee (provided that the Employee shall
not have returned to the performance of the Employee's duties on a full-time
basis during such thirty (30) day period), (ii) if the Employee's employment is
terminated by the Parent for any other reason, the date on which a notice of
termination is given, or (iii) if the Agreement is terminated by the Employee,
the date on which the Employee delivers the notice of termination to the Parent.

     7.   Successors.
          ----------

          (a) Parent's Successors.  Any successor to the Parent (whether direct
              -------------------
or indirect and whether by purchase, lease, merger, consolidation, liquidation
or otherwise) to all or substantially all of the Parent's business and/or assets
shall assume the obligations under this Agreement and agree expressly to perform
the obligations under this Agreement in the same manner and to the same extent
as the Parent would be required to perform such obligations in the absence of a
succession.  For all purposes under this Agreement, the term "Parent" shall
include any successor to the Parent's business and/or assets which executes and
delivers the assumption agreement described in this subsection (a) or which
becomes bound by the terms of this Agreement by operation of law.

          (b) Employee's Successors.  The terms of this Agreement and all rights
              ---------------------
of the Employee hereunder shall inure to the benefit of, and be enforceable by,
the Employee's personal or legal representatives, executors, administrators,
successors, heirs, distributees, devisees or legatees.

     8.   Notices.  Notices and all other communications contemplated by this
          -------
Agreement shall be in writing and shall be deemed to have been duly given when
personally delivered or when mailed by U.S. registered or certified mail, return
receipt requested and postage prepaid.  In the case of the Employee, mailed
notices shall be addressed to him at the home address, which he most recently
communicated to the Parent in writing.  In the case of the Parent, mailed
notices shall be addressed to its corporate headquarters, and all notices shall
be directed to the attention of its Secretary.

     9.   Miscellaneous Provisions.
          ------------------------

          (a) No Duty to Mitigate.  The Employee shall not be required to
              -------------------
mitigate the amount of any payment contemplated by this Agreement, nor shall any
such payment be reduced by any earnings that the Employee may receive from any
other source.

          (b) Waiver.  No provision of this Agreement shall be modified, waived
              ------
or discharged unless the modification, waiver or discharge is agreed to in
writing and signed by the Employee and by an authorized officer of Parent (other
than the Employee).  No waiver by either party of any breach of, or of
compliance with, any condition or provision of this Agreement by the other party
shall be considered a waiver of any other condition or provision or of the same
condition or provision at another time.

                                       6-
<PAGE>

          (c) Whole Agreement.  This Agreement contains a complete statement of
              ---------------
all the arrangements between the parties with respect to its subject matter,
except the Merger Agreement and the Founder's Escrow Agreement, and this
Agreement supercedes all other previous or contemporaneous agreements between
the parties concerning its subject matter.  Nothing herein shall be construed as
prohibiting the parties from entering into additional future agreements or
written modifications of the aforementioned agreements.

          (d) Choice of Law.  The validity, interpretation, construction and
              -------------
performance of this Agreement shall be governed by the laws of the State of
California without reference to rules or conflicts of law.

          (e) Severability.  The invalidity or unenforceability of any provision
              ------------
or provisions of this Agreement shall not affect the validity or enforceability
of any other provision hereof, which shall remain in full force and effect.

          (f) No Assignment of Benefits.  The rights of any person to payments
              -------------------------
or benefits under this Agreement shall not be made subject to option or
assignment, either by voluntary or involuntary assignment or by operation of
law, including (without limitation) bankruptcy, garnishment, attachment or other
creditor's process, and any action in violation of this subsection (g) shall be
void.

          (g) Employment Taxes.  All payments made pursuant to this Agreement
              ----------------
will be subject to withholding of applicable income and employment taxes.
Nothing herein shall be construed as affecting the tax treatment of awards,
stock options, stock grants and other forms of payment made under separate
agreements between the parties, including but not limited to the Merger
Agreement, related transactional documents, and any stock grant or stock option
agreements.

          (h) Assignment by Parent.  The Parent may assign its rights under this
              --------------------
Agreement to an affiliate, and an affiliate may assign its rights under this
Agreement to another affiliate of the Parent or to the Parent; provided,
                                                               --------
however, that no assignment shall be made if the net worth of the assignee is
-------
less than the net worth of the Parent at the time of assignment.  In the case of
any such assignment, the term "Parent" when used in a section of this Agreement
shall mean the corporation that actually employs the Employee.

          (i) Counterparts.  This Agreement may be executed in counterparts,
              ------------
each of which shall be deemed an original, but all of which together will
constitute one and the same instrument.

          (j) Termination.  This Agreement shall terminate on the earlier of (i)
              -----------
the Termination Date, or (ii) the third anniversary of the Effective Time.

     10.  Arbitration.  In the event of a dispute between the parties arising
          -----------
from or concerning in any manner the Employee's employment or the subject matter
of this Agreement, the parties will refer the dispute to arbitration pursuant to
California Code of Civil Procedure Section 1280, et seq., including Section
                                                 -- ----
1283.5.  The arbitration and selection of the arbitrator shall proceed in
accordance with the

                                       7-
<PAGE>

National Rules for resolution of employment disputes of the American Arbitration
Association. The arbitrator shall issue a written award setting forth his or her
findings and calculations. The award shall be final and binding. The Parent will
pay all administrative and arbitrator fees associated with the arbitration. All
other fees and costs, including attorneys fees, shall be borne by the respective
parties. The arbitration will be held in San Francisco, California.

                                       8-
<PAGE>

IN WITNESS WHEREOF, each of the parties has executed this Agreement as of the
date hereof.


                              ZEAL MEDIA, INC.


                              By:
                                 -------------------------------------
                              Name:
                              Title:


                              LOOKSMART, LTD.


                              By:
                                 -------------------------------------
                              Name:
                              Title:


                              EMPLOYEE


                              By:
                                 -------------------------------------
                              Name:














                    [SIGNATURE PAGE TO EMPLOYMENT AGREEMENT]

                                       9-