Here is the FAQ from USCIS,
Q10: Will USCIS accept employment-based adjustment of status applications under July Visa Bulletin No. 107 if the priority date is August 1, 2007 or later?
A10. No.
Q11: Will USCIS accept adjustment applications under July Visa Bulletin No. 107 if the priority date is before July 31, 2007, but the certification is granted after August 1, 2007?
A11. Yes, USCIS will accept such cases provided they are submitted by August 17, 2007.
Q12: Will USCIS accept concurrently filed I-140s/I-485s filed after July 31 when a labor certification is not required (i.e. priority date is established on or after August 1)?
A12. USCIS will accept properly filed Forms I-140 filed on behalf of aliens with a priority date on or after August 1, 2007; however, pursuant to August Visa Bulletin No. 109, USCIS will reject any concurrently filed adjustment of status applications filed by aliens with a priority on or after August 1, 2007.