Interesting, I can see how that would be useful, although some of that is already working using XMPP (Google Talk, really).
Is there a way to be notified when you have XMPP integration? Most of our dev tools integrate with it[1][2] and having some of those notifications(build failure, issue fixed) stream into a common area would be very cool.
[1] http://www.jetbrains.com/youtrack/whatsnew/ [2] http://blogs.jetbrains.com/teamcity/tag/jabber/
Edit: wrt/ YouTrack, it doesn't support group chats yet(see http://youtrack.jetbrains.com/issue/JT-18866).