[briga]

I would recommend Kevin Kelly's website truefilms.com for a great list of documentaries on a large variety of topics. No matter what your interests are you're sure to find something interesting on here.

Werner Herzog has produced a number of fascinating documentaries that are just as good as his fictional films in my opinion. Wings of Hope, Encounters at the End of the World, Cave of Forgotten Dreams, Grizzly Man--he has an enormous talent for drawing profound, almost mythical ideas out of the subjects he captures. He's not for everyone, certainly, but his films have a unique vision you don't often see in documentaries.