Zotero rolled out new versions of the stable and beta releases this week. I had a bit of a glitch getting the sync function to work with this beta version, but a little digging through the Zotero forums fixed that.
More interesting is the fact that they've added online user profiles. If you set up an account on the Zotero site (reserve your name!), you can suddenly upload a user picture, follow other users, and optionally make your entire library visible if you're syncing with the Zotero server.
I hope this means that we might expect to see recommendations and citation sharing soon. I'm looking forward to Amazon-style "researchers who liked this article also liked...."