UI is very nice and simple, one tiny bit of feedback is that a 'guidelines' page would be worthwhile, especially while it's new! I thought I'd post my own project on the site - sometimes that's a little bit of a no-no though, and I couldn't find any guidelines to steer me towards what types of things to share, etc.
Edit: Tiny extra feedback, is upvoting something immediately changes the rankings in the browser. It's pretty impressive speedwise, but especially if you're a couple pages in, you can bump something off of the page you're on which makes it a little weird to do something like 'upvote article and then check the comments'.
