National Film Board of Canada

[ReCycled]

There's a lot of good quality documentaries here at their website. Some have won academy awards. I prefer the nature stuff and documentaries but there is historical stuff, animation and oddball biographies too. The navigation to find what you want could be better but I usually just use their search function. You can watch Fullscreen and the quality is still ok. Here's one on drug addiction and living on the street.

http://www.nfb.ca/film/through_a_blue_lens/