iSamurai is a crazy two-player app that recreates real Samurai sword fighting without the flesh wounds or ritual disembowelment.

The app uses the iPhone’s built-in motion sensor and accelerometer to tell where the iPhone is in space and make noises that suggest that you are fighting with swords. It connects to another player’s iPhone with peer-to-peer networking and looks pretty goofy. Clearly the concept of fighting with invisible swords takes a bit of skill and imagination but it’s a fascinating use of all of the iPhone’s motion features. It’s available now for 99 cents.

The iPhone and iPod Touch have three accelerometers ...

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