I know I've only just arrived but I wouldn't mind the introduction of a rep system; it works well on the other vBulletin boards that I visit. There's always the problem of pointless negative rep but the users dishing it out can get rep bans and the like.
I've seen a few posts here already that I'd love to give some positive rep to but when I've gone over to click the scales or the exclamation mark there's been a blank space.
I realise that it's not important to have a rewards scheme to get people posting (because people should be posting for the sake of discussion) but I think it's nice to give people a bit of recognition in the form of little blobs.