runtastic
runtastic is a mobile app that tracks sports performance. The free ite version automatically tracks distance, time, speed, pace, and displays your route on a map. You can share results on Twitter and Facebook.
The Pro version includes voice feedback, no adds, geotagging, heartrate monitoring, live tracking, and you can create individual workouts. The Pro version costs $5.99 to download.
More apps are available just for the iPhone, including walktastic Pro, cytastic Pro, runtastic Wintersports free and Pro, and Fitnessmeister free and Pro.