I have watched several documentaries and presentations about Peak Oil and the following is in my opinion the most informative, complete and comprehensive, if only a bit shocking for some people (with spanish subtitles btw):
Crude Impact: The most boring due to slow talking, long static scenes and general lack of moving statements or facts. Still recommendable.
Oil, Smoke and Mirrors: Its first part is a really good summary of the Peak Oil phenomena and its implications, straight to the point and even more mind-opening than The End of Suburbia. It switches to 9/11 conspiracy theory mode, however, and only wraps around Peak Oil a little bit at the end. Highly Recommendable if you can take that with a grain of salt.