The latest update for killer iPad racing game Real Racing 2 HD adds the ability to play the game in 1080p at 30 frames per second using your iPad as the steering wheel.
While the update is free, you will need some hardware to get this to work. Developers Firemint say you'll need to have an iPad 2, a copy of the game, an Apple digital AV adaptor, an HDMI cable and an HDMI compatible display.
Once you're geared up you just connect the adaptor to your iPad 2, plug the HDMI cable in and launch the game. Real Racing 2 even allows you to disconnect and reconnect the cable in-game, meaning you can switch from TV play to iPad 2 only play on the fly.
When playing on an external display your iPad 2 will act as both the steering wheel and display to show real-time telemetry.