http://buddyspace.sourceforge.net/
BuddySpace is a cross-platform, open source Jabber client (and specialized Jabber server) that does some cool stuff.

One cool thing it does is visually locate people on maps!
Check out the movie demo.
They're working on it. In fact, maybe they are; the web site says they're working on it, but maybe they've got it by now.
There are lots of styles of maps available:
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CategoryPresence?
CategoryInstantMessaging?
Define external redirect: CategoryInstantMessaging CategoryPresence