Public Domain: Sounds, Images, Audio, Video

Many sounds/images/video clips are available for your use. Items in the public domain are free and clear of copyright restrictions.

Free, public domain sound, images, audio: http://www.archive.org

Free, public domain sounds: http://www.pdsounds.org/catalog
[Free Sound Library: Public Domain Sounds]

Free, public domain sound, images, audio: http://www.djusd.k12.ca.us/technology/images.htm

Free music: http://freeplaymusic.com