Right, i have an idea, just want to see if its 'do-able' You know google has the new street view, would it be possible to stick a guy in there and be able to control him with the arrow keys?
There is a game made with the api called 'real world racer' which you control a car over google maps can be found here: http://www.thomasscott.net/realworldracer/
i'm on about the 'street view' mode with like a 3rd person mode, walking around the streets, not a birdseye view