sit2510 - 5:31 am on Jul 12, 2005 (gmt 0)

>>> So just how is one supposed to find which of these PR 0 sites are possibly penalized?

One of the clues is to do site:thatdomain.com. If that site appeared to exist for a period of time, but no page indexed in Google then foul smell is there.

BUT please be forwarned that it won't worth your time to check every site just for the sake of wanting to know if it was penalized or not, related to the open topic of this thread.