I was just talking with Jeremie Miller, leader of Jabber.org. Jabber.com and Jabber.org just went through a significant reshuffle of its priorities. Jabber.org will be improving it's developer focus now, trying to open up. What I would think might be interesting is plugging something like a real time Jabber-based MeatBall:WhoIsOnline system into a site, or a network of sites. Or even updating a network of sites in real-time with each other's status using their dedicated socket protocol. Jabber is a lot more than instant messaging.
Yes, this is a rehash of what's posted on MeatballWiki, the meatball mailing list, and the p2pj list. I'm just really happy about it. Jabber is cool.