A few months back, you might remember watching the above video, which displayed some smart head tracking on the iPhone/iPad, similar to the famous Nintendo Wii head tracking video a couple of years ago. Now, that demo is available as a free demo app for the iPad 2 and iPhone 4 - and that app is called i3D.
We've downloaded it, and it works really well! Kinda.
Okay, let me rephrase that - for some reason it won't track my giant enormous head. It works perfectly well with everyone else I've seen try it. Except me. Because of my giant oversized head.
If you happen to be in possession of an iPhone 4 or an iPad 2, I'd totally recommend giving it a bash. I'd love to see this tech integrated into an iPhone game at some point in the future.
'i3D' Demo App Shows Off Head-Tracking 3D on iOS Devices [Mac Rumours]