Document:

<PAGE>

                             Note to Exhibit 10.8

       The Engine Warranty Assignment is incorporated by reference from the
Company's Form 10K filed with the Commission for the period ending December 31,
2000.  The five additional Engine Warranty Assignments are substantially
identical in all material respects to the filed Engine Warranty Assignment
except as follows:

<TABLE>
<CAPTION>

      Aircraft (Tail No.)                 Closing Date                   Owner Participant
-----------------------------------------------------------------------------------------------------
<S>                                     <C>                       <C>

N362ML*                                 October 19, 2000           Silvermine River Finance One, Inc.
-----------------------------------------------------------------------------------------------------

N363ML                                  November 29,2000           Aircraft Services Corporation
-----------------------------------------------------------------------------------------------------

N364ML                                  January 30, 2001           Aircraft Services Corporation
-----------------------------------------------------------------------------------------------------

N365ML                                  March 19, 2001             Aircraft Services Corporation
-----------------------------------------------------------------------------------------------------

N366ML                                  April 19, 2001             Castle Harbour-I Limited
                                                                   Liability Company
-----------------------------------------------------------------------------------------------------

N367ML                                  June 11, 2001              Aircraft Services Corporation
-----------------------------------------------------------------------------------------------------
</TABLE>

----------
* Filed documentExhibit 10.7

                                 PROMISSORY NOTE

Executed at Houston, Texas
Dated:  August 14, 2000
Principal Sum:  $1,080,712

FOR ADVANCES RECEIVED, from time to time over the years since 1993, totaling as
of June 30, 2000 the principal sum shown above, REDOX TECHNOLOGY CORPORATION, a
Delaware corporation with principal offices located at 340 N. Sam Houston
Parkway East, Houston, Texas 77070 promises to pay the to the order of RICHARD
A. SZYMANSKI (hereinafter "Lender") the principal sum set forth above on or
before December 21, 2000 (hereinafter "Maturity Date").

The loan represented by this Promissory Note shall initially bear no interest to
December 31, 2000; however, if this Promissory Note is not paid, in full on or
before the Maturity Date, interest shall be retroactively be applicable for the
period from the date hereof to the Maturity Date at the rate of ten percent
(10%) per annum, simple interest from the date hereof. If Borrower fails to pay
the full amount of principal together with the interest thereon on the date it
becomes due, Borrower shall be in default. The unpaid principal and the unpaid
interest thereon retroactively calculated shall thereafter both bear interest at
the rate of eighteen percent (18%) per annum until paid; but this provision
shall not increase the liability of Borrower beyond the legal interest rate. If
any law, which applies to this loan and which sets maximum loan charges, is
finally interpreted so that the interest or other loan charges to be collected
in connection with this loan exceed permitted limits, then this loan shall not
be void but any such interest or loan charge shall be reduced by the amount
necessary to reduce such collection ,including reasonable attorney fees in case
payment is not mace when it becomes due. Presentiment, notice of dishonor, and
protest are hereby waived by the Borrower. This note is to be construed and
enforced in accordance wither he laws of the State of Texas, in existence on the
date of this Promissory Note.

IN WITNESS WHEREOF, intending to be legally bound, the Borrower has executed
this Promissory Note as of the date above written.

                          REDOX TECHNOLOGY CORPORATION

                                                By: /S/ RICHARD SZYMANSKI
                                                    -------------------------
                                                    Richard A. Szymanski

ATTEST:

/S/ CLIFTON D. DOUGLAS
----------------------
Clifton D. Douglas, TreasurerETesting Labs Inc.
                                                1001 Aviation Parkway, Suite 400
                                                           Morrisville, NC 27580
                                                               Tel: 919-380-2800
                                                               Fax: 919-380-2889
                                                            www.etestinglabs.com

ReDOX Technology Corporation has requested that eTesting Labs Inc. ("eTesting
Labs") execute performance benchmarks on a number of systems with and without
the ReDOX software installed ReDOX Technology Corporation and eTesting Labs
hereby agree as follows:

1.   eTesting Labs responsibilities:

          a.   Supply all testing personnel and desktop systems for test.

          b.   Supply all performance benchmarks.

          c.   Follow the test methodology below, to which ReDOX Technology
               Corporation and eTesting Labs have agreed

2.   ReDOX Technology Corporation responsibilities:

          a.   Supply necessary ReDOX software for testing

          b.   Supply an AMD based laptop.

          c.   Supply an Intel based laptop.

          d.   Supply a technical contact.

          e.   Promptly respond for requests for information and other injuries
               from eTesting Labs.

3.   Basic Test methodology: eTesting Labs will execute the performance
     benchmarks listed below on the following systems with and without the ReDOX
     Software installed.

o    AMD ~500MHz-3D WinBench 2000, Win Bench 99, Business Winstone 2001

o    AMD ~1000MHz-3D WinBench 2000, WinBench 99, Business Winstone 2001

o    Intel-500MHz- 3D WinBench 2000, WinBench 99, Business Winstone, 2001

o    Intel-1000MHz- 3D WinBench 2000, WinBench 99, Business Winstone, 2001

o    Intel-Laptop 3D WinBench 2000, BatteryMark, WinBench 99, Business Winstone,
     2001

o    AMD Laptop 3D WinBench 2000, BatteryMark, WinBench 99, Business Winstone,
     2001

4.       Analysis/Report:

          a.   Testing Labs will prepare a report on its findings. That report
               will include the following:

                    (i)  The tests and methods eTesting Labs used;

                    (ii) The test machine configurations; and

<PAGE>

                    (iii) A summary of overall test results.

          b.   Upon payment in full of all sums due hereunder, eTesting Labs
               will grand to ReDOX Technology Corporation all right, title and
               interest in and to such report, including the copyright therein.

5.       Report publication

          a.   ReDOX Technology Corporation may use the test results for
               internal and external uses.

          b.   In all uses of the report, ReDOX Technology Corporation has the
               right to not publish the report.

          c.   ReDOX Technology Corporation has the right not to publish the
               report.

          d.   Upon ReDOX Technology Corporation's request, eTesting Labs will
               publish the report on the eTesting Labs Website.

          e.   ETesting Labs will not reprint, distribute, or publish the test
               results without the express consent of ReDOX Technology
               Corporation unless required any law or court order.

6.   Testing Dates; eTesting Labs will schedule the test once:

          a.   eTesting Labs has received a signed copy of the Agreement;

          b.   eTesting Labs has received a Purchase Order for the full amount
               of this Agreement; and

          c.   eTesting Labs has in hand all hardware and software that ReDOX
               Technology Corporation has agreed to provide. Testing will be
               complete within two business weeks of receiving the software and
               laptops for testing.

7.   Price: ReDOX Technology Corporation agrees to pay to eTesting Labs, for the
     services to be performed hereunder, a testing fee in the amount of USD
     $11,000.00 eTesting Labs will invoice the entire amount upon receipt of a
     Purchase Order for the full amount of this Agreement.

All invoices shall be paid within thirty days of the date of invoice.

8.   General:

          a.   As between eTesting Labs and ReDOX Technology Corporation,
               eTesting Labs owns and will own all right, title and interest,
               including without limitation, copyright, patent, trade secret and
               other proprietary rights, throughout the world in and to its
               proprietary hardware software and methodology, including nay
               modifications or improvements thereto , used to perform the
               Services. AS between eTesting Lags and ReDOX Technology
               Corporation, ReDOX Technology Corporation owns and will own all

<PAGE>

               right, title and interest, including without limitation,
               copyright, patent, trade secret and other proprietary rights,
               throughout the world, in and to its proprietary hardware,
               software nd methodology, including any modifications or
               improvements thereof, used by eTesting Lags to perform the
               Services.

          b.   IN NO EVENT SHALL eTesting LABS LIABILILTY FOR DIRECT DAMAGES,
               EXCEED THE AMOUNT SET FORTH IN PARAGRAPH 7 HEREIN. IN NO EVENT
               SHALL ETESTING LABS OR ITS SUPPLIERS BE OIIABLE FOR INDIRECT,
               SPECIAL, INCIDENTAL, PUNITIVE OR CONSEQUENTIAL DAMAGES IN
               CONNECTION WITH THIS AGREEMENT. EVEN IF ADVISED OF THE POSSIBLITY
               OF SUCH DAMAGES, ReDOX Technology Corporation ASSUMES ANY OTHER
               RIS FOR THE REPORT AND THE RESULTS AND PERFORMANCE OF ETESTING
               LABS' SERVICE HEREUNDER.

          c.   ReDOX Technology Corporation agrees that it shall not require or
               attempt to compel eTesting Labs to testify as an expert witness
               or participate in any way in any litigation in connection with
               the subject matter of the Services provided by eTesting Labs
               hereunder.

          d.   (i)  ReDOX Technology Corporation agrees that is shall not use
                    eTesting Labs' trademark or name in any press release,
                    advertisement or promotional distribution without eTesting
                    Labs' prior written consent in connection with the release
                    of the report or otherwise.

               (ii) Notwithstanding the foregoing, eTesting Labs hereby grants
                    to ReDOX Technology Corporation a nontransferable,
                    non-exclusive, royalty-free license and right, during the
                    term of this Agreement to reproduce eTesting Labs' name and
                    logo (the "eTesting Labs Marks") on the report provided by
                    eTesting Labs hereunder solely in connection with the
                    distribution of such report provided that in the event that
                    ReDOX Technology Corporation alters or modifies the report
                    in any ay, all rights to use the eTesting Labs Marks shall
                    immediately terminate, and ReDOX Technology Corporation
                    shall remove the eTesting Labs marks from the report and
                    cease distribution of any reports containing the eTesting
                    Labs Marks.

              (iii) All rights arising from the use of the eTesting Labs Marks
                    and/or any similar names or marks (including logos) shall
                    inure solely to eTesting Labs' benefit. ReDOX Technology
                    Corporation agrees that neither ReDOX Technology
                    Corporation, nor ant entity which directly or indirectly
                    owns or controls, or is owned or controlled by, or is under
                    common control with ReDOX Technology Corporation(a "ReDOX
                    Technology Corporation Affiliate"), shall use, directly or
                    indirectly, eTesting Labs Marks, or any marks similar

<PAGE>

                    thereto, as part of ReDOX Technology Corporation's or any
                    ReDOX Technology Corporation Affiliate's own trade name, as
                    a trademark, service mark or trade name for any other
                    product or service, or in any other way that suggests that
                    there is any relation or affiliation between eTesting Labs
                    and ReDOX Technology Corporation or any ReDOX Technology
                    Corporation Affiliate.

               e.   ReDOX Technology Corporation agrees not to hire any eTesting
                    Labs employee for a period of one year after the termination
                    of this Agreement. In the event that ReDOX Technology
                    Corporation hires an employee of eTesting Labs during or for
                    a period of one year after the term of this Agreement, ReDOX
                    Technology Corporation shall pay to eTesting Lags a fee
                    equal to thirty five percent (35%0 of such employee's
                    starting annual compensation with ReDOX Technology
                    Corporation.

               f.   ReDOX Technology Corporation grants to eTesting Labs the
                    right to cite its name and/or logo in promotions listing
                    clients for which eTesting Labs has provided services

               g.   ReDOX Technology Corporation agrees that this Agreement
                    constitutes the full and complete agreement between ReDOX
                    Technology Corporation and eTesting Labs for the project
                    specified herein and that this Agreement supercedes any
                    other agreements between the parties, including specifically
                    but not limited to any terms on ReDOX Technology
                    Corporation's standard Purchase Order.

               h.   The parties hereto are independent contractors, and nothing
                    contained in this Agreement shall be deemed to create a
                    joint venture or partnership relationship between the
                    parties. Neither party shall have any right or authority to
                    bind or obligate the other party in any manner whatsoever,
                    except as expressly set forth in this Agreement.

               i.   Neither party hereto shall be responsible for a force
                    majeure event, including delay or failure in performance
                    resulting from acts of God, acts of nature, unavailability
                    or supplies or sources of energy, riots, war any
                    governmental act or order of a court, fires, floods,
                    embargoes, strikes, or similar acts. Either party shall have
                    the right to terminate this Agreement if the force majeure
                    event prevents the other party from performing its
                    obligations for a period of more than sixty days. In the
                    event that this Agreement is terminated due to a force
                    majeure event the parties shall have no further obligation
                    or liability hereunder.

               j.   A waiver by either party of any term or condition of this
                    Agreement in any instance shall not be deemed or construed
                    as a waiver or such a term or condition on the future. The

<PAGE>

                    failure or delay of either party hereto in exercising any of
                    its rights under this Agreement shall not constitute a
                    waiver of such rights.

               k.   This Agreement shall be interpreted in accordance with, and
                    governed by the laws of the State of New York regardless of
                    the place of execution or performance.

Please indicate your acceptance of the terms of the Agreement by signing below.
Then fax the Agreement and a valid Purchase Order to Ging Massel-Castater at
919-380-2889 (Gina Massel-Casteter@ziffdavis.com). At your convenience, please
mail us the original Agreement.

ReDOX Technology Corporation:               eTesting Labs, Inc.

Name:    Richard Szymanski                  Name:    Bill Catchings

Title:    CEO                               Title:   CFO

Date:    2-14-00                            Date:    February 15, 2000

Signature: /s/ Richard Szymanski            Signature: /s/ Bill Catchings

cc. Gina Massel-Castater

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