My wife and I watched this last night, about the race for Donkey Kong supremacy between two guys. Great documentary, even better if you care at all about video games. Some of the people, Billy Mitchell specifically, are just too much to believe, my wife though it was some kind of mockumentary at first because it's almost hard to believe he is who he is.
Another recommendation would be Two Days in April, follows 4 guys entering the 2006 NFL draft out of college, 2 from Oklahoma, 1 from ASU and 1 from New Mexico. Really cool behind the scenes look at all the preparation that goes into making a successful draft candidate.
Both are on Netflix instant viewing for anyone that's interested.