This is a collection of documentary videos about FOSS found on the Internet (in chronological order), enjoy!
The Codebreakers (2006) A wonderful documentary by BBC world that shows the benefits of FOSS in a variety of situations especially in the developing countries but also shows it's advantages in wealthy countries.
Revolution OS (2002) A great documentary, all the great names of FOSS are interviewed. A good insight into the revolution! (Linus Torvalds, Richard Stallman, Bruce Perens, Eric Raymond and many others).
The Code Linux (2001) Nice philosophical and historical documentary about the Linux kernel and the Free and Open Source movement.
Please let me know if you know other documentaries, I'd love to hear about them!