The details: RunKeeper is a free GPS-enabled fitness app available on both the iPhone and, as of last week, Android. When fired up, the app tracks how far a walker, runner, hiker, or biker has traveled, including average speed, distance, calories burned, and route. The proud athlete can also tie the app into Twitter or Facebook to let others know her progress and location. The $9.99 Pro version of the app lets users generate reports based on their training, analyzes runs, and enables audio cues (like "Run faster!").

RunKeeper’s take: While training for his first marathon in 2007, founder and CEO Jason Jacobs realized the need for more information while on the go, and the iPhone emerged around the same time as the perfect means to deliver that info. Turns out more than a million mobile phone owners agreed. Jacobs said growth and continued improvements are his main goal now.
"Our big vision is, as the smartphone market matures, any carrier or device or platform that emerges as a contender, we want to be there and be the leader," Jacobs says.
[Ed. Note: In case you were wondering, the iPhone beat Android at the Boston Marathon, but it was Android's first time... and he was barefoot. Story of his life.]
— Sarah Reedy, Senior Reporter, Light Reading Mobile
I've only used RunKeeper on the iPhone, but I'd like to try it on Android. My biggest problem with the app was that if I took a call or viewed a text while using the app, it'd kick me out. It saved my spot, but it was frustrating to not be able to use Pandora or other music apps either. I imagine Android, with its ability to multitask, is better. Anyone tried it yet?