One thing I've noticed is that when there's a new post (original or reply) to a thread, it gets listed in the New Posts section of the sidebar. But when someone else replies to that, that post gets a listing in the New Posts section, and THE FIRST LISTING GOES AWAY. This this a bug or a feature?
I would like the first (earlier) mention of a new post to NOT go away until it "ages out" at the bottom. By leaving it visible, it's easier to see which threads are "hot topics" right now.