Price: $4.99 on App Store
Turns an iPhone 3G or 3GS into a GPS stopwatch, giving feedback and motivation to walk further. The device records your time, location, distance and elevation and pace for walks up to six hours. Results are shown on maps, graphs and a calendar. The app tracks how much distance is walked by day, week, month and year. You can compete against previous walks by ranking each walk in order to beat your own time and/or distance.