Tokyo Underground is a new application, specifically developed for the iPhone 3GS, that enables you to visualize subway stations and Points of Interest (POI) located in your nearby environment, thanks to a unique Augmented Reality functionality using the iPhone camera.
http://www.tokyometroiphone.com/
http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=305633751&mt=8
