GPS::Tron, seriously

Score one more for old school geekiness
made new by modern technology — GPS::Tron tracks players'
movement in real space (okay, so they got that part wrong) via GPS and, as per the rules of Tron, they can't cross their own line or another player's. All you need is two players, two GPS-enabled phones (they've got it working on some Nokia and Siemens handsets with Bluetooth GPS receivers) with some sort of data plan, and to remember but one thing: they haven't built a circuit that could hold you!

[Via Near Near Future]