I would not normally reproduce a previous post from a different thread, but since there seems to be considerable angst developing on this issue, I thought it may be useful to stray from that rule here. Accordingly, here is my take on the published processing dates, as posted in a different thread from a couple of days ago. Apologies if folks find it repetitive.
"The processing dates that are put out by the INS through AILA (note that this information is not in theory available to the public even though INS is a government agency) are just intended to serve as a line in the sand to trigger status inquiries from applicants' lawyers (and it seems, also members of congress). In order to limit the number of such inquiries, the service centers tend to move the published processing dates only after they have been able to clear out almost all of the backlog as of such dates. So for example, NSC will move forward from Aug. 22, 2001 for I-485 (EB) cases only after they have finished processing, say, 95-99% (this is my guess, the actual level may be different) of the cases filed before this date.
Hence, the dates are unlikely to provide an accurate picture of the actual processing situation at the various service centers."
So even though, NSC may be saying that they are processing Aug. 22, 2001 I-485 EB cases, we know that in actuality they are much further along (more like end-Nov with respect to cases from the third world).