I don't know if it's me that's blind, but I can't find any 'mark forum as "read"' link anywhere. That might be a good idea to have, now that the forums no longer (for me, at least) unmarks themselves on exit.
Hmm, does that make sense?
I'll use an example:
I visit the forums, read a few threads that interest me, skip the ones that don't.
Close my browser.
Later on, I come back to see what's new and the ones I skipped earlier are still marked as unread (red folder).
Some way of telling the database that I'm not interested in the rest of the threads (unless there are new posts again) would be nice, just a suggestion