There are so many driving and racing games for the iPhone, it's crazy. Many of the games use the accelerometer of the iPhone to control the car on screen. The iPhone gets tilted left or right to turn in the appropriate direction.
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Those wanting more realism in their mobile driving games can now get the Posimotion Helix gaming grip. The grip will make its debut at CES next month and lets users clip the iPhone or iPod touch into the steering wheel accessory.
The Helix wheel will be available for purchase early next year at an undisclosed price. I have never really seen a use for this sort of thing myself. It's hardly different from just holding the iPhone in your hands and it seems like it would be hard to reach the screen to activate things like boost while holding the grip.