Twiiter Im : the idea is transform twitter social relations, into a Distributed Instant Message Network. In other words, we could build something close to facebook chat system, that works in any website by just inserting a simple js script. So you would be able to see what friends are current online, and engage deeper discussions that are not possible in 140 chars.
So mainly its similar to meebo/mashable integration, but without needing to register in any place, and much more simpler.
The best part of this idea, to me, is that would be a great project to push erlang to the max
What you think?