-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Iz1xpRmiUEj9GpfHMEq4ami+RwGQDAg2n/JTfcsllT0wg0s02j4A7KVEf6SmzuH9
 YUL7GpTt0c3VBiaVgSjQaQ==

<SEC-DOCUMENT>0001181431-06-051648.txt : 20060907
<SEC-HEADER>0001181431-06-051648.hdr.sgml : 20060907
<ACCEPTANCE-DATETIME>20060907160913
ACCESSION NUMBER:		0001181431-06-051648
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060905
FILED AS OF DATE:		20060907
DATE AS OF CHANGE:		20060907

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CMGI INC
		CENTRAL INDEX KEY:			0000914712
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-DIRECT MAIL ADVERTISING SERVICES [7331]
		IRS NUMBER:				042921333
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0731

	BUSINESS ADDRESS:	
		STREET 1:		1100 WINTER STREET
		STREET 2:		SUITE 4600
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02451
		BUSINESS PHONE:		781-663-5001

	MAIL ADDRESS:	
		STREET 1:		1100 WINTER STREET
		STREET 2:		SUITE 4600
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02451

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CMG INFORMATION SERVICES INC
		DATE OF NAME CHANGE:	19981007

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Riley David
		CENTRAL INDEX KEY:			0001364356

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-23262
		FILM NUMBER:		061079409

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		781-663-5001

	MAIL ADDRESS:	
		STREET 1:		1100 WINTER STREET
		STREET 2:		SUITE 4600
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02451
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>rrd129544.xml
<DESCRIPTION>FORM 4 - RILEY 9-7-06
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-09-05</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000914712</issuerCik>
        <issuerName>CMGI INC</issuerName>
        <issuerTradingSymbol>CMGI</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001364356</rptOwnerCik>
            <rptOwnerName>Riley David</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CMGI, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>1100 WINTER STREET, SUITE 4600</rptOwnerStreet2>
            <rptOwnerCity>WALTHAM</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02451</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Interim CFO and Treasurer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2006-09-05</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>4313</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1.12</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>28083</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Shares sold are shares of restricted stock as to which the forfeiture right in favor of the issuer lapsed on September 2, 2006 and such shares were sold pursuant to a pre-existing Rule 10b5-1 Sales Plan established by the reporting person on October 8, 2003.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Thomas B. Rosedale (Pursuant to Power of Attorney)</signatureName>
        <signatureDate>2006-09-07</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----