Do the U.S. Citizenship and Immigration Services (USCIS) has issued a new I-9 form, with a revision date of August 7, 2009.  The new form will be valid until August 31, 2012.  The form can be: http://www.uscis.gov/files/form/i-9.pdf

There are no substantive changes in the new form so the old form, with a revision date of February 2, 2009, is still acceptable.  However, that form is likely to be eliminated at some point, so it’s probably wise to start using the new form now.