iCade - iPad Arcade Cabinet
The iCade($150) from thinkgeek, it is an arcade cabinet accessory for your iPad.
To use the iCade, gently slide the iPad into the docking cradle. The docking cradle uses a standard 30 pin connector to link the iPad to the professional-grade arcade controls. Once the iPad is in place, launch the iCade App (available free in the App Store April 3rd) and it's game on! We didn't want to take any chances you'd run out of juice during your favorite game, so we included a 10w USB power adapter so you can charge the iPad through any electrical outlet.