Over at the Audi forum, you can select the topics you want to track manually.
http://www.audiworld.com/forum/4000.html
On the right side is a "tt" for "track topic". If you click on it, it turns red and says "ut" (for "untrack topic") If you make a post, or post a reply, it automatically enables the tracking for you, but you can manually untrack it. Otherwise it work the same as here, new stuff goes to the top. But if someone makes a reply to one you're tracking, it comes to the top. But stuff you don't care about just fades off into the sunset as new stuff is posted.