Frappr!

This is a new cool new tool I just found out about. Frappr allows you to create a group of people and then show where these users are on a Google map. It's hard to describe, but there is a group for blogging librarians at www.frappr.com/blogginglibrarians that can give you an idea of how it works. I've been thinking of other ways libraries may be able to use this. Perhaps creating a map of wireless libraries. Any other ideas out there?