You can now map of Twitter Lists with Twiangulate.

For example, here's a map of Jeff Jarvis' Media Wonks list.  The full list of 192 tweeps doesn't map well -- this is an <strike>incestuous</strike> highly networked world.  So the map defaults to display only those tweeps with bilateral links (as opposed to a one directional follow) with more than 10% of the people on the list.

It's interesting to note that Jay Rosen, of NYC, is mutual friends with 88% of the people on the list.  There's lots of other good data to mine here -- we'll be getting to that soon.

To build a map, look for "Build a map" in the navigation cluster at the top of the page.  To view maps other people have built go to "Group maps."