Read threads, actually, but red threads sounds more interesting, perhaps, somehow, maybe, maybe not... Question: is there anyway other than actually clicking on a thread to make it "read" (unmark it)? Would it be possible that if you open one of the categories and just read the thread you are interested in, and then click out of the category, that the threads you didn't read now show unread. I am not always interested in reading all of the threads in a category, but I end up clicking on them because I don't like to leave them marked unread. I guess the same could be true for the categories... You come to the main page, read the threads you are interested in that show there is a new message; leave, and next time you come back, the categories you didn't open are now marked read (unless there was a new message there in the meantime). Maybe this is already possible, and I just missed it. Did I make this too confusing?
