OK this iPhone application is very cool! Nike & GPS lets you track the distance and speed of your running. Set the type of music you want and off you go.
After you finish the run, check the your Nike iPhone app and view the route, distance, and average speed. You can even find your best mile speed!
I love my iPhone and I love running. This lets me combine the two and use this great app to track what I do, while I listen to music from the iPod songs loaded on my iPhone.