There's a nifty little free demo you may want to pick up that uses the iPad camera to do some head tracking and create a kind of faux 3D on your iPad display. We took a look at an early demo for this ...
A nifty new emulator lets you play NES games in 3D - sort of. It's still pretty rough, but the idea behind the software works in practice. Footage posted to Reddit shows NES classics Super Mario Bros.