http://www.marathonmovie.com/home.html
There's a preview of it on the web page. It's been in the works for a couple of years, and they keep putting back the release date.
One of the elites they follow is Deena Kastor. Watching her win the bronze in Athens is by far my favorite track and field moment. She was once stung in the back of the throat by a bee 100 meters into a race. She blacked out because of it, then got up and finished the race.