I've been to a few forums that allow you to "pin" a forum to be returned to later. This is a really nice feature, especially for those of us who browse from more than one location. It is usualy implemented as a list of topics somewhere that I can go to in order to view the pinned topics, or "un-pin" them.
I wonder if it wouldn't be fairly easy to add: the functionality is already there with "subscribe" to a topic (since I can see what topics I'm subscribed to from my profile), but when I subscribe, I keep getting email, which I don't really want. A second option to pin the topic to a favorites list would be a real boon for me.
Of course, if it's hard to add the feature, I can keep using the -subscribe- feature, and just filter the email.