I have put some glue between xmpp4r and twitter, et voila, a Jabber component mapping
microblogging to a Jabber Multi-User-Chat.

Working right now:

• friends joining as participants


• friends timeline


• posting updates


• sending and receiving direct/private messages

Missing:

• follow/unfollow (I'd like to implement this as invite/kick)


• blocking (ban)


• avatars (can be easily done)


• a lot more

You can try this out by joining the MUC-room {identi.ca|twitter}@omb.jabber.teamidiot.de
and using your username as nickname and providing your password.
As this is not safe (I might steal your password) I suggest to setup your own component,
try it out and provide feedback.

The repository (mercurial) is at: http://gonzo.teamidiot.de/repos/ombmuc/.