Japan carries have a variety of mobile phones with accelerometers that let you play Chokkan (motion) games, send an email with a flick of your wrist, and use the phone physically to interact with applications. Recently, much has been made of using the onboard cameras to accomplish the same thing, and there are more and more cool applications coming out.
With the success of games like guitar hero Taito released Chokkan Band. The sensor on the phone detects movement, allowing anyone to use the phone as a guitar, violin, drums, or other instrument. Synched up together, you can create an entire band in perfect harmony, jamming out to songs downloaded through the service. The game is free, but songs come at a small fee.
Here is a Video from Reuters about the app
And here is the Campaign video… sad isn’t it