We just deployed a new release (v2-0-20111122), you can now see this version number at the bottom of the page. We've added a TinyMCE editor to the comments, so you can now format your comments all pretty-like (don't overdo it). There is now an "Needs more work" button available if a student has submitted their work. Requests and Invites are listed on your dashboard, so that if you lose the original email you can check your dashboard instead.
The avatar picker is now live as well! Avatars will be shown on the leaderboard and in comments in a future release, but you can go ahead and choose your avatar now!
There's a couple of known issues:
* Some students are having trouble with uploading their work, we're looking into this.
* There is no list of completed tasks on the student dashboard yet