Apple iTunes has Mountain Bike PRO Cycling Computer powered by runtastic for Free. Compatible with iPhone, iPod touch, and iPad. Requires iOS 4.0 or later.
Apple iTunes has Cycle Tracker Pro for Free to download. Compatible with iPhone 3G, iPhone 3GS, iPhone 4, iPhone 4S, iPad 2 Wi-Fi + 3G and iPad Wi-Fi + 4G. Requires iOS 3.0 or later.