Hey man, just wondering what change you made to the forum? It doesn't appear to be caching the search results page anymore. In the past, whenever I used the 'New Posts' link it would list all the threads. I would click on one, then use 'back' to the search page and then click on the next, etc. However it would never mark the threads as being read when I went 'back'. Now, not only does it mark the threads as being read when I click on back, it will also update with any newly posted in threads and move them up to the top and mark them as unread.
Whatever you did, great job!
EDIT: Nevermind. I just checked again and it didn't do it...weird.