Where's the Bear?

[mdlbear]

I use too many different computers. At any given time I might be on one of three machines at home, or one of two at work. Managing things like browsers, email clients, and IM clients, all of which get upset if I'm using the same account from two different places, is a bit of a chore. IM is the worst; the others are at least manageable.

All of those machines know whether I'm typing at them or not. In many cases, based on the time of day, they might have a pretty good idea of where I am when I'm not typing. It would be really good if there were some kind of service, independent of IM, that could manage my presence, kill off extraneous IM and email clients if necessary, and let people know the best way to contact me.

It could probably be done with Jabber, a private XMPP server, and a batch of specialized clients. Anyone out there know of something like that? Preferably for Debian or Ubuntu.