where to find films in public domain?

[pebblesdundee]

Hi, does anyone here know a website I can use to find films, books or such things that are in the public domain? Thank you to anyone that can help.

 

[Alcove Audio]

http://www.archive.org/details/prelinger

 

[PositiveFuture]

wikimedia commons...

There's also a few good list threads here.