Looking for a Twitter Map

Hey PLN! Got a question for you.

@schickbob is looking for an app that maps Twitter followers sort of like ClustrMaps does for folks who drop by your webpage.

I've tried foller.me and the Yahoo Pipes maps, but found the first far too clunky and the latter limited in its usage to only 100 followers.

I'm looking for something more substantial.

And so my question is: Do you use or know of any quality Twitter map services?

(Eagerly awaiting responses).