Copyright Free content can be found at the following sites (please add others if you know of them):  
 
Video:  
http://www.usa.gov/Topics/Video.shtml (case sensitive - capital T & V)  
http://www.unitedstreaming.com (teacher must log student in)  
 
Photos:  
http://www.usa.gov/Topics/Graphics.shtml (case sensitive - capital T & G)  
 
Music:  
http://www.freeplaymusic.com