Just was given a link to this site by someone recommending "The Yes Men," which I watched and is a pretty neat story about these two pranksters that went all over the world impersonating WTO officials on an anti-globalization agenda.
But the real point is they have like 100 documentaries available for streaming.
Since it's free, my first guess was that they would all be flicks made by fringe, extremist whack-jobs*, but there are plenty of mainstream ones as well such as Fog of War, Bowling for Columbine, Born into Brothels, Life and Debt, Super Size Me and others that I've already seen and know are at least widely considered to be credible even if you don't love the perspective.
Anyway, check it out:
* Indeed, things like "Loose Change" and another that I haven't seen called Origins of AIDS are there which seem pretty full of ****.