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Images from the sources linked below are usable provided that they are cited.
Creative Commons search that allows you to one-stop-shop for online works included under the free-to-use Creative Commons license. Sites searched include Flickr, Google, Yahoo, blip.tv, and OWL Music Search. Be sure to check the individual CC license restrictions before using the resource, as some results included in your search may not be open source or CC licensed.
Everystockphoto is a search engine specializing in searching Web sites with Creative Commons, GNU, or open source licensed content, including Nasa, Wikimedia Commons, and the morgueFile. Click the "advanced search" link on this site to access search options including limiting by usage license type and picture size or shape.
Whether or not you choose to sign up for a free account with Flickr, you have access to a wealth of amateur to professional-level photographs made available by the over 35 million registered members of Flickr. Keyword search for photos and limit your results to Creative Commons licensed-content to spice up any presentation or help drive a point home with an appropriate image: all you have to do is attribute the source!
Library of Congress Prints & Photographs
Over 1.25 million prints and photographs are archived in LOC's Prints and Photographs Online Catalog (PPOC). From their site: "The collections [...] include photographs, fine and popular prints and drawings, posters, and architectural and engineering drawings. While international in scope, the collections are particularly rich in materials produced in, or documenting the history of, the United States and the lives, interests and achievements of the American people."
Open Clip Art Library
From their Web site: "This project aims to create an archive of user contributed clip art that can be freely used. All graphics submitted to the project should be placed into the Public Domain according to the statement by the Creative Commons."