You know what would be an amazing iPhone app?
- Take a long turn based strategy game like Risk.
- When you turn on multi-player have it detect your location.
- Have it find people near you. Near enough for a Bluetooth connection to work (say in an office).
- Join up in a game with everyone around you via Bluetooth.
- Have updates be sent via Push Notifications when it is your turn, or when you are being attacked.
This would be a pretty great way to get through a work day (or week).