I just noticed that new threads have a PR of 1. How did you manage this Shawn? Have you got a site map pointing to a bunch of non existant threads?
There was a PR update in the last week or so. Also, for dynamic url's, Google has a thing where sometimes every url say in the format - http://forums.digitalpoint.com/showthread.php?t=6636 with the ?t= gets 1 pr1. You can test this by throwing in some garbage id e.g. - http://forums.digitalpoint.com/showthread.php?t=98756573 hope this helps, Eric