There's a hack that can be found at vbulletin.org (or at least it used to be...) called Public Display of Affection. Basically, in conjunction with the reputation feature (seems to be disabled here, but it is in the software), it lets posters comment on a particular post without creating a new post, indicating their agreement or disagreement; the titles "agree" and "disagree" can be changed. I think this would be useful in Mac Programming, and any of the help forums, to let posters "mod up" (to use Slashdot's terminology) posts that are accurate and useful, and "mod down" those that aren't.
Just a thought.
Just a thought.