Canada's National Film Board, or NFB for short, has been producing movies, ranging from animated shorts to documentaries to full-length features, since forever. They gave finally got around to opening a youtube-style website where you can watch all their films. There are over 700 films currently uploaded, with more added daily.
Here are some highlights:
1978 cartoon about death and the afterlife by Ishu Patel
1939 film about unemployment in the Depression
women pilots in WWII by Jane Marsh
Norman McLaren's Le Merle, 1958