This is a tremendous resource! The value of this resource is in its availability, at least in the United States (see copyright notice to users outside of USA).
The site offers audio books read by both computer and human, compilations, data, sheet music, recorded music, moving pictures, still pictures, and other recordings.
In addition to the site's browsing and search features, the site also taps into other search engines like Anacleto, Yahoo, and Google. Be careful, though, because this site is one that you will find yourself chasing 'rabbit holes' on the web until way too late!