Here’s a new, strange little app; Gyro Draw lets users draw with the iPhone 4’s gyroscope, by sliding a piece of virtual paper (responding to inputs from the gyroscope) under a stationary virtual pencil. Don’t have a 4? It also works with the older iPhone’s accelerometer, only in this mode it’s the pencil that moves. Also works on the iPad.
Not sure this app’ll produce anything prettier than the etch-a-sketch masterpieces I made when I was five, but it’s free right now for a limited time, so it might be cool for a quick impress-your-gyroscopeless-friends session.