"Ginipic takes image search to a whole new level. Now you can search image search engines, photo sharing websites or your own local picture collections simultaneously. Find what you're looking for and use it instantly in your own creation - document, presentation, art work"

Free to use, the site provides high-quality, digital images that can be used by teachers and students. The only proviso seems to be that they can't be sold on. Find images by keyword of browsing.

"This is the US Teachers' Guide for using the Professional Cartoonists Index web site in your classes. We have developed lesson plans for using the editorial cartoons as a teaching tool in Social Sciences, Art, Journalism and English at all levels."