I'd like to see the vote button used more productively.
For example, when coming across a thread like this one with 300-odd posts, it'd be nice to be able to select to 10 top-rated posts so you can get a quick gist of the thread (and hopefully weed out all the "+1" rubbish).
Sadly, with a forum full of corporate fanatics, the positive rated posts aren't always the 'best' posts, IMO. I might actually prefer seeing the most negative votes in many threads as they are the POV I'd be more likely to agree with, this one included.