iPad games that use iPhones/iPods as controllers

So not only is Real Racing 2 cross-platform compatible, but you can now do split screen on an HDTV using iDevices as controllers

PAD RACER

YOU CAN EVEN USE TWO IPADS TO EXTEND THE RACE COURSE!

Chopper

Fifa 12 lets two players use their iPhone/iPod as a controller to control everything on the iPad like it were the TV.

Scrabble! Play a local game with everyones smartphone and an iPad as the main viewing board! No more peeking at people's letters!