it is a great film, also check out powaqqatsi. the third in the trilogy naqoyqatsi isn't so great, but the music is good. Since i've gotten into quality films, i can't really enjoy hollywood crap anymore, with a few exceptions (LOTR) Anyway, if you seek any more documentaries that will make you think I suggest:
Hearts and Minds
Manufacturing Consent: Noam Chomsky and the Media
Dark Days
those three films really had an effect on me
also Nature Stuff with David Attenborough (life of birds, life of mammals, blue planet, etc.)
another excellent film just recently released on dvd is Wings of Desire
I only suggest these movies to people who like to think when they watch a film. I see most mainstream movies as eye candy, sense candy, whatever. The films i like are more like brain candy to me, I also recommend "The World at War" that has been on dvd for a while, it is 26 program (hour each) documentary on world war 2, and is fascinating.