http://www.findsounds.com/

LITERAL:
FindSounds.com is a free site for finding sound effects and musical instrument samples on the Web. It is a Web search engine, like Google and AltaVista, but with a focus on sounds. It provides powerful features, yet is simple and easy to use, and suitable for all ages. Note to parents: audio files containing obscenities are filtered out so this site is safe for children.