Internet Archive - Feature Films
If you buy as many cheap, old, public domain movies on dvd as I do, you'll be either excited or disappointed to see tons of them here, free for you to download. Rocket Men From the Moon, Dick Tracy serials, Ace Drummond, The Big Trees, Night of the Living Dead, tons.

I'm not sure whether to rush home and record a bunch of these, or just watch them and assume that they're going to be free and available later whenever I want. Weird.