If you enjoy racing games, and I mean really enjoy racing games, you probably have had your eye on one of those fancy steering wheel setups for a while now. You know, the ones with pedals, a gear stick, and realistic rumble? The problem is such a setup is quite expensive and not every racing afficionado can afford such extravagence.
Enter the Tilt Racer app.
Racing games have had a lot of success on the iOS platform because of tilt controls, and now with this app, you can transfer that control to your PC and any racing game on that platform through your iPhone. Not only can you smoothly steer with your phone, sitting in front of the computer, but there's a simple slider for accelerating and braking, and four programmable buttons for gear shifting or any other feature you might want. Have a look at the demo video.
Now obviously this is not a long term solution as you don't get the tactile feel and feedback that a steering wheel provides, but it is a very inexpensive solution that would be a lot better than playing with a keyboard or gamepad. If you enjoy PC racing games, it could be worth a try.
[App Store Link]