Remember Dodgeball? Google bought it, then didn't do anything with it, then axed it. This is the new dodgeball.

See this article for more info. http://www.observer.com/2009/media/foursquare-hot-new-phone-...

Not sure about the choice of name (it confused me at first). Foursquare is a fairly prominent snowboarding gear company that has been around for years.