RunKeeper Pro uses the built-in GPS in the new iPhone 3G and 3GS to enable runners, cyclists, hikers, skiers, walkers, etc. to track their outdoor fitness activities. » RunKeeper Pro Track Your Activities

RunKeeper is a upcoming App Store application. RunKeeper will allow you to do sports and track your activity. The application uses the built-in GPS of the iPhone 3G. (yes only iPhone 3G). the application uploads the data to their website and you can watch online your tracks via google maps. The application keeps track of altitude, speed and distance.
» App Store – RunKeeper