Check out this new app. It’s called Joypad and you can find it on the app store for free. This new app allows you to sync your iPhone to an iPad over Bluetooth. What this does is quite amazing. It turns your iPhone into a controller to play games on your iPad. It’s also possible to use Airplay to send the video to your TV, now that’s pretty sweet! The SDK for this app is also free and you can find all the info including the links here courtesy of 9 to 5 Mac.
On the down side this app only works for the games the have been made to use this function (via Joypad SDK). So this means that you cannot use it with any games that you currently own. Games that support this app need to be purchased from the app store. While this app supports some cool features like skins (.99 ea), multiplayer support, multiple layouts and WiFi, Bluetooth or Ad-hoc networking capabilities. It may not be the right choice for just any gamer.