I recently tried out Flight Control, a game for the iPhone which puts you in charge as an air traffic controller. It is your job to route the different planes to their respective runway. With iPhone OS 3.0 came a feature for Bluetooth PAN (Personal Area Network), which means that the iPhone is now capable of creating ad-hoc networks with nearby phones on the fly. The new Flight Control update takes advantage of this new feature to bring multiplayer!
In multiplayer mode, two iPhones share the same air space, but are in charge of landing strips for different kind of aircraft. You then have to work together to route the planes to the correct landing strip without crashing the planes into each other. This brings a whole new dimension to this already highly addictive game, so if you haven’t downloaded it already, buy it from the App Store.