I sure hope he can get this fixed, it will take forever to have everyone repost!!!
Alrighty, I think I got them all. The attachments were hiding in a secret little subfolder, and had not been copied over when I made the updates. I did notice a few attachments seem to have really been missing, even before I updated the site, such as http://www.photoshopcreativeelements.com/viewtopic.php?f=8&t=36. The missing ones seem to be the oldest ones around.
I also gave the database a good scrubbing while I was in there, hence the performance slow down over the past 10 minutes.