I started with my favorite documentaries. Vote them up or down. Feel free to add other documentaries you like.
http://m.ranker.com/list/documentaries-you-may-like/foxtrot,
Darkon
The Thin Blue Line
Who the Fuck Is Jackson Pollock?
Exit Through the Gift Shop
Marwencol
Blood Into Wine
Life in a Day
Into the Abyss
Yes Men Fix the World
How to Survive a Plague