On November 7, 2007, the USCIS issued a newly revised Form I-9. The new form, with the revision date of June 5, 2007, is the only form that is valid for use.
Here is the announcement from USCIS:
WASHINGTON-U.S. Citizenship and Immigration Services (USCIS) announced today [11/7/07] that a revised Employment Eligibility Verification Form (I-9) is now available for use. All employers are required to complete a Form I-9 for each employee hired in the United States.