USCIS presentation for the 8/23/11 teleconference hosted by NSC and TSC on the Form I-140, Immigrant Petition for Alien Worker. There will be an opportunity for live questions at the end of the session.
This entry is now old law. The new law is at http://www.immigration.com/blogs/i-140-ead-regulations-effective-17-jan…
5 November 2015: After some flip flops, USCIS has gone back to allowing carry forward of priority dates even if I-140 is revoked by employer - as described in this discussion. So, we are good for now.