http://search.creativecommons.org will help you find photos, music, text, books, educational material, and more that is free to share or build upon utilizing Creative Commons enabled search services at Google and Flickr. You can also access this tool via
Today CC Search comes out of beta, with over 300 million images indexed from multiple collections, a major redesign, and faster, more relevant search. It's the ...
Many Flickr users have chosen to offer their work under a Creative Commons license, and you can browse or search through content under each type of license. Here are some recently added bits and pieces: Attribution License