A couple of months ago, filmmaker Scott Burdick posted parts one and two of The March of Reason. The footage comes mostly from the Reason Rally and individual interviews with atheists, many of whom are familiar to readers of this site.
Burdick has now posted part three of his film (some of the footage, involving body painting, may be NSFW):
Burdick plans to create an edited 90-minute “documentary-style” version of the film after all five parts are posted.