Amazon has some familiar free movies at Unbox:

Free Movie Comedies
Charade |
Chaplin Mutuals: Behind the Screen |
His Girl Friday |
Laurel and Hardy: Lost Films |
My Man Godfrey

Free Movie Dramas
The Snows of Kilimanjaro |
Battleship Potemkin |
House on Haunted Hill |
Love Affair |
Man With the Golden Arm

Sometimes I think it's dishonest to DRM public domain or, even if this is unDRM'd, which I doubt, package this up in a fairly closed fashion., for example, has tons of these ready for download. That's a much better source for grabbing free movies, rather than use them as enticements to learn how to use Unbox.

But that's just neurotic me.