iPhone developer Ziconic has released a video that demonstrates usage of the digital compass in the new iPhone 3GS as a view control mechanism.
A prototype build of the developer’s AirCoaster 3D [App Store], an app that allows users to design and ride 3D roller coasters on the iPhone and iPod touch, allows the user to move the iPhone about in order to change the viewpoint of the rider.
The compass-based view control is expected to arrive in a future update of the application. Ziconic also recently released a video comparing the 3D performance of the new iPhone 3GS to that of the iPhone 3G, using AirCoaster 3D as a benchmark.
App Store Link: AirCoaster 3D, $0.99