iPad Tablet PC which has been introduced by Apple is not a sole computing media tablet only. It’s also supporting gaming functionality so chance are some manufacturer will begin to release an addons or peripheral to support the gaming needs. Similar to the Steering Wheel for iPhone, there is a gaming accessory concept by iPad called ‘iDrift iPad’ that practically stuffed the iPad into the middel of a large steering wheel to play racing games.
iDrift iPad Game Controller for iPad is designed by Michale Greenberg, and there is no idea when you can get one (it’s still a concept). Perhaps you can make your Wii peripheral or find a broken steering wheel and tied it up with the iPad for the instant game controller.