http://www.youtube.com/homeproject
A film by Yann Arthus-Bertrand about life, the universe and everything... it takes one and a half hour, but take the time to watch it for free on you-tube... it's fantastic.
Beautiful footage, scientifically correct (as far as I can tell), keep watching through the pessimistic patch, there's an optimistic turn the last 15 minutes, and it's worth it.