Documentaries for geeks or about geeks? The ones about geeks will probably be really boring. They'll leave out both the technical stuff and the potentially actionable war stories. "Revolution OS", for instance, was a well-crafted film, but pretty dull if you read Slashdot.
Branch out a bit. Off the top of my head:
"The Pleasure of Finding Things Out": Richard Feynman talks. (Danny Hillis pops up for a bit.)
"The Fog of War": a smart, reflective person discusses how he presided over a huge disaster.
"Lost in La Mancha": Terry Gilliam takes a bunch of risks to get a movie started and doesn't make it.
"Around Cape Horn": Captain Irving Johnson describes sailing around the Horn on one of the last windjammers.
"Walking with Dinosaurs": Woo! Dinosaurs!
"Apollo 13" is not an actual documentary, of course, but it's fun and reasonably faithful for a big-budget movie.
I just watched Revolution OS. Really enjoyed it. Indeed it is somewhat of old news to many of us, but it is also nice to see the faces and personalities driving the GNU, Linux, and FOSS movement as a whole.
Branch out a bit. Off the top of my head:
"The Pleasure of Finding Things Out": Richard Feynman talks. (Danny Hillis pops up for a bit.)
"The Fog of War": a smart, reflective person discusses how he presided over a huge disaster.
"Lost in La Mancha": Terry Gilliam takes a bunch of risks to get a movie started and doesn't make it.
"Around Cape Horn": Captain Irving Johnson describes sailing around the Horn on one of the last windjammers.
"Walking with Dinosaurs": Woo! Dinosaurs!
"Apollo 13" is not an actual documentary, of course, but it's fun and reasonably faithful for a big-budget movie.