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Royalty Free Images
http://photosforclass.com/ = citations provided!  Specifically for schools!
Pics4Learning.com = Citations Provided!
Awesome Art = Royalty Free: Classic Artists
The Metropolitan Museum of Art (Free images are marked "OASC" = Open Access for Scholarly Content)
Rijksmuseum - Dutch Masters
Pond5 -  Royalty-free footage, audio, images, and visual effects.