Exhibit 4.1

CMGI, INC. (the “Corporation”) will furnish without charge to each stockholder who so requests from its Secretary the powers, designations, preferences and relative, participating, optional or other special rights of each class of stock or series thereof and the qualifications, limitations or restrictions thereof.

The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable laws or regulations:

TEN COM	–	as tenants in common	UNIF GIFT MIN ACT–		Custodian
TEN ENT	–	as tenants by the entireties		(Cust)		(Minor)
JT TEN	–	as joint tenants with right of
		survivorship and not as tenants in common		under Uniform Gifts to Minors
				Act
					(State)

Additional abbreviations may also be used though not in the above list.

For value received, ______________________________________________________ hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE

___________________________________________________________________________________________________________

PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS INCLUDING POSTAL ZIP CODE OF ASSIGNEE.

___________________________________________________________________________________________________________

___________________________________________________________________________________________________________

____________________________________________________________________________________________________ Shares of the Common Stock represented by the within Certificate, and do hereby irrevocably constitute and appoint ________________

_______________________________________________________________________________________________________

Attorney to transfer the said stock on the books of the within-named Corporation with full power of substitution in the premises.

Dated,___________________

(The signature to this assignment must correspond with the name as written upon the face of this Certificate in every particular, without alteration or enlargement or any change whatever.)

SIGNATURE(S) GUARANTEED:

THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM), PURSUANT TO S.E.C. RULE 17Ad-15.