Here application and game from here.... Enjoy it!

Heres a good application for your Windows Phone 7. with it you will be able to determine your current speed in Kilometers or Miles per hour, altitude in Meters or Feet and the distance made from point to point while recording your max speed. The free version will work for an unlimited time with all the features but it will show ads.

GPS Speedometer is application that shows your current speed (KPH or MPH), altitude (meters or feet) and distance traveled. It has scale for running, cycling, driving and even flying, and records your top speed for every activity.

You can Download GPS Speedometer in here