Getflypad.com: Turn your phone into a steering wheel for racing games?

Do any of you Mac fans like playing racing games or flight sims? Just started building for Mac/iOS, and one thing I thought would be cool, would be to turn your iPhone or iPod touch into a steering wheel. This would be for racing games like Asphalt 6 etc in the Mac App Store

I put up a landing page at http://www.getflypad.com . Would love your thoughts/feedback on if you'd play with this, how to make it good/better etc.