It would be cool to have more information about votes on posts and comments. Specifically, it would be really cool to be able to see total upvotes, total downvotes and a percentage score. Reddit used to have this feature and it was pretty cool. Plus there's a huge level of difference in terms of interest of a post that's single digit score because no one cares about it and a post that's single digit score because it's really skub. A view count would be cool, too, but that's a bit less interesting.
(Reddit used to have functionality like this, but they later removed it for some reason.)