Finding Images
Google images hosts a large repository of LIFE images, Time claims blanket copyright to everything but this is simply untrue. (see here and also see here) Anything more than 120 years old (ie - before 1889) is generally safe. (exception is if the original author died less than 75 years ago--45 years after these PD pictures have been taken--, the author lived in a state with Common_law_copyright, and the name of the author is know---and in that case Time itself is most likely in copyright violation.) You must remove the watermark if you use the larger image.
Wikipedia Free Images (Browse through topic lists) http://en.wikipedia.org/wiki/Wikipedia:List_of_images
Common Content http://commoncontent.org/
Creative Commons http://creativecommons.org/find/
Open Photo Project http://openphoto.net/
Yotophoto http://yotophoto.com
Free Pixels (new)
Pics4Learning http://pics.tech4learning.com/
Wise Gorilla Educational Clip Art http://www.wisegorilla.com
PD Photo http://pdphoto.org
America From the Great Depression to World War II: FSA/OWI 1935-1945 http://memory.loc.gov/ammem/fsowhome.html
American Memory Collection: Library of Congress (click on "Photos and Prints" and check the "Copyright and Restrictions" section for each collection) http://rs6.loc.gov/ammem/mdbquery.html
American Memory Maps Collection http://memory.loc.gov/ammem/gmdhtml/gmdhome.html
Art Images for College Teaching http://www.mcad.edu/AICT/index.html
Open ClipArt Library http://www.openclipart.org/
Centre for Bioscience ImageBank http://bio.ltsn.ac.uk/imagebank/
Daguerreotype Portraits and Views 1839-1864 http://memory.loc.gov/ammem/daghtml/daghome.html
Department of Agriculture Image Gallery http://www.ars.usda.gov/is/graphics/photos/index.html
Department of the Interior Photo Resources Library http://www.doi.gov/oirm/photolib/
FreeFoto.com http://www.freefoto.com/
Free Photo 1 http://www.freephoto1.com/
Graphic Maps.com http://www.graphicmaps.com/clipart.htm
Great Images in NASA (GRIN) http://grin.hq.nasa.gov/
Images of American Political History http://teachpol.tcnj.edu/amer_pol_hist/
Internet Moving Images Archive (read Conditions of Use) http://www.archive.org/movies/
Metropolitan Museum of Art http://www.metmuseum.org/home.asp
(Please read copyright info on http://www.metmuseum.org/copyright.htm)
NARA's (National Archives and Records Administration) NAIL Search http://www.nara.gov/cgi-bin/starfinder/0?path=images.txt&id=demo&pass=&OK=OK
NASA Image Exchange http://nix.nasa.gov/
NASA Multimedia Gallery http://www.nasa.gov/gallery/index.html
NASA Photo Archive http://www.nasa.gov/gallery/photo/index.html
NASA's Planetary Photojournal http://photojournal.jpl.nasa.gov/
National Health Museum (AccessExcellence) http://www.accessexcellence.org/RC/VL/GG/
National Library of Medicine: Images from the History of Medicine http://wwwihm.nlm.nih.gov/
Picture Collection Online (New York Public Library) http://digital.nypl.org/mmpco/
NOAA Photo Library (National Oceanic and Atmospheric Administration) http://www.photolib.noaa.gov/
Open Clip Art Library http://www.openclipart.org/cgi-bin/navigate
Public Health Image Gallery http://phil.cdc.gov/Phil/home.asp
*Pics4Learning (A great collection of donated photos!) http://pics4learning.com/
Picturing the Century: 100 Years of Photography http://www.nara.gov/exhall/picturing_the_century/home.html
Science Images http://www.ase.org.uk/cgi-bin/imageFolio/imageFolio.cgi?direct=Science
Science Images (Earth Zone) http://www.ase.org.uk/cgi-bin/imageFolio/imageFolio.cgi?direct=Earth_Zone
Selected Civil War Photographs http://rs6.loc.gov/ammem/cwphome.html
Training Reference: Images for Learning Materials http://www.trainingreference.co.uk/free_pictures/index.html
US Air Force Link: Photos and Art http://www.af.mil/photos/
US Fish and Wildlife Services Images http://pictures.fws.gov/
US Geological Service Photographic Library http://www.usgs.gov/fact-sheets/photographic-library/photographic-library.html
US Navy Images http://www.history.navy.mil/branches/org11-2.htm
USDA Historical Photos http://www.usda.gov/oc/photo/histfeat.htm
UTOPIA (UT Austin) Portrait Gallery http://utopia.utexas.edu/project/portraits/ (historical figures)
Wikipedia Public Domain Image Sources http://en.wikipedia.org/wiki/Wikipedia:Public_domain_image_resources
Related links