Run Sarah Run

Running is hard work. Give me a bike anyday. Some people enjoy it, though. In fact, some people enjoy it enough to beat the crap out of themselves by racing others of a like mind over a 26.2 mile course.
Sarah is one of the latter. She had a whole crew of people cheering for her in the 2009 NYC Marathon, but with over 2 million spectators, they needed a way to make sure she heard them. Run Sarah Run gave it to them with a combination of Flickr, Yahoo Maps, and Drupal.