Just tossing my two cents in here, but aside from thread subscriptions (works great) and the 'New Posts' button that is on the menu bar of the forum that an "Unanswered Posts" button is a very useful feature to have; it's nothing more than a "New Posts" button that automatically sorts the threads based on the number of responses to them.
I find this useful because if I'm looking at New Posts I don't want to necessarily catch a thread that's already 10-50 posts deep even if it has a new response, what I want to see is the one's that are only 0-5 deep that may have been lurking around for a little while without good response as opposed to jump hip deep into something that may require me to read 2-3 pages of thread posts to even catch up on.
I know this can already be done in Advanced search, but having a quick button for it on the menu bar is priceless to people that want simple quick navigation.
I find this useful because if I'm looking at New Posts I don't want to necessarily catch a thread that's already 10-50 posts deep even if it has a new response, what I want to see is the one's that are only 0-5 deep that may have been lurking around for a little while without good response as opposed to jump hip deep into something that may require me to read 2-3 pages of thread posts to even catch up on.
I know this can already be done in Advanced search, but having a quick button for it on the menu bar is priceless to people that want simple quick navigation.