Something I've encountered that's a bit annoying and wouldn't be too hard to fix (I think) is that when someone links something, it doesn't open a new window (or tab for me). It basically means that I have to hit back (possibly a number of times) instead of just closing the tab when I want to browse back to the forum, but I find it less convenient.
So if links would open a new window by default, this would be swell.
edit: dammit, I posted this in the wrong forum.