Is there a facebook app that allows you to browse your friend list by location on a map (like a google maps mash-up with friend’s locations)?

Seems like a useful idea. I haven’t played with developing Facebook apps, so I have no idea how difficult it would be to use an external mapping application to plot where friends are….but would be interesting to find out. Could also be cool if it updated as people changed their location when travelling.

Taken from the TwitEye idea stream