I was thinking this might actually be an interesting idea. Have a racing game that uses something like Google Maps or Mapquest or Yahoo maps as the basis for the roads. It would also track weather and traffic conditions also. You could do something like The Great American Cross-Country Road Race (Activision did this in 8 bit days), or like the movies Gumball Rally or Cannoball Run.
If roads or bridges are out or added, the game would update. Of course, trying to render buildings right would be a challenge, but maybe with enough storage, you can have enough. You could, for giggles drive by your own house in the game.
Anyone think this might be a cool idea? The thread of Fuel put this in my mind.