http://www.imdb.com/title/tt0218817/

It gets 6 out of 10 on IMDB but I think it helps to be a bit techie to like
this kind of movie hence perhaps the low rating.
It is not a serious documentary film by the way but more a tongue in cheek
drama.

It is not available online as far as I can tell but I have noticed that
certain documentary films are available online such as:

The Code Linux
video.google.com/videoplay\
Iai8igLx3d3jCQ

Ubuntu linux google tech talk with Mark Shuttleworth
video.google.com/videoplay

Revolution OS
video.google.com/videoplay

The Free Software Movement with Richard Stallman
video.google.com/videoplay

and lots of others too on Google Video (just search for Linux) ...