Sites for Free Photographs

Google Image Search
http://images.google.com

U.S. Government Graphics and Photos
http://www.firstgov.gov/Topics/Graphics.shtml

KidsClick - Kids Image Search Tools - a nice collection of image searches for kids
http://www.kidsclick.org/psearch.phpl

Bigfoto.com - Free for personal or commercial use
http://www.bigfoto.com/

FreeFoto.com - Free for personal use, a fee for commercial use - From Britain
http://www.freefoto.com/

Geek Philosopher - Vague terms of use- appears to be free for personal and commercial use. Many US Government public domain photos
http://www.geekphilosopher.com/MainPage/photos.htm

Stock Stash - Vague terms of use - appears to be free for personal or commercial use. Registration required
http://www.stockstash.com/

Morgue File - Vague terms of use - appears to be free for personal or commercial use
http://www.morguefile.com/

Barry's free photos - For personal use only
http://www.barrysfreephotos.com/

Free Photographs Network - For personal use only. Email notification to artist required
http://www.free-photographs.net/

FreeRange Stock Photos
http://www.freerangestock.com/

InMagine Royalty-Free Collection
http://www.inmagine.com/

DVCreators - Where Can I Find Stock Photos? - A large collection of links to free photo sites.
http://dvcreators.net/ws/where-can-i-find-free-stock-photos

Pics 4 Learning is specifically designed for teachers and students, and has thousands of images that can be used freely.
http://pics4learning.com/

Freepik - Free Vectors, PS docs, photos.
http://www.freepik.com/