CMGI, INC.

LIMITED POWER OF ATTORNEY


	This statement confirms that the undersigned has
authorized and designated each of Peter L. Gray, Veronica
Zorrilla and Thomas B. Rosedale his attorneys-in-fact to
(i) prepare, execute and file on behalf of the undersigned Form
ID or any other necessary documents or forms in order to obtain
access codes (including, without limitation, CIK and CCC codes)
for the undersigned to permit filing on EDGAR, and (ii) prepare,
execute and file on behalf of the undersigned all Forms 3, 4 and 5
(including any amendments thereto) that the undersigned may be
required to file with the U.S. Securities and Exchange Commission
as a result of the undersigned's ownership of or transactions in
securities of CMGI, Inc.  The authority of such attorneys under
this Power of Attorney shall continue until the undersigned is no
longer required to file Forms 3, 4 and 5 with regard to the undersigned's
ownership of or transactions in securities of CMGI, Inc., unless earlier
revoked in writing.  The undersigned acknowledges that such attorneys
are not assuming any of the undersigned's responsibilities to comply
with the requirements of Section 16 of the Securities Exchange Act of
1934, as amended, or any of the undersigned's liabilities for failure to
comply with such requirements.


Date: May 25, 2006		 			/s/ David Riley
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							David Riley