Today NASA launched their Lunar Electric Rover Simulator app for the iPhone / iPad Touch.
You want to Discover how LER's turning radius, ability to move in multiple directions, attached suits, and habitat capabilities optimize safety and exploration efficiency? If so, you'll love this app.
You can also do a virtual test drive of the Lunar Electric Rover.
Very cool stuff indeed.
Requirements: Compatible with iPhone and iPod touch. Requires iPhone OS 2.2.1 or later.