List of links to copyright-friendly search, clipart, music, etc.
Copyright for educators: http://www.thecopyrightsite.org/
Digital Copyright Slider (determine what is in the public domain): http://librarycopyright.net/resources/digitalslider/

Creative Commos search: http://search.creativecommons.org/
Copyright-friendly resources for education: http://copyrightfriendly.wikispaces.com/
Royalty Free usic: http://www.royalty-free-music-room.com/music-downloads.html
Freeplay Music: http://www.freeplaymusic.com
Incompetech royalty-free music: http://incompetech.com/music/