My personal favorite NFB film (and piece of Canadian film in general)...
Yes Sir! Madame
http://www.imdb.com/title/tt0352002/You wont find it to stream on the NFB site unfortunately, in fact I've only ever seen 1 copy in my whole life which I had to track down at a local library. It's a "documentary" (or is it) about a man who's mother just died and she leaves him a camera and a couple of rolls of film and tells him to do something with it. So he documents his life. EXTREMELY thought provoking, and profoundly disturbing.