Commencing July 2, 2007, USCIS has decided to no longer permit employers to premium process I-140 Immigrant Petitions for all employment-based categories.  This is a temporary decision only. 

Starting August 1, 2007, employers will once again be permitted to premium process their I-140 cases. This is due to the "pent up demand for preference visa categories for which visas will become available according to the Department of State July 2007 Visa Bulletin". Please refer to the USCIS Press Release of June 27, 2007 at:

http://www.uscis.gov/files/pressrelease/I140PPSTempSusp062706.pdf