PBS Teachers.org - Resources for reading & language arts, science & technology, math, social studies, health & fitness, art, music.
Teachers' Domain is a free digital media service for educational use. Media resources, support materials, and tools.
Gamequarium.com - Lots of free educational games, also lots of ads. Let Erin know if any of the games are ones you would like on your classes webpage.
Smithsonian's History Explorer - Free lessons, activites, museum artifacts, audio, video, and interactive resources.
PhysicsGames.net - 200+ games based on the properties of physics. Some start with an advertisement.
EngineeringInteract.org - Interactive science and engineering for 9-11 year olds. Games and teacher resources from the University of Cambridge.
Harcourt teacher resources.
BBCSchools.org - Free lesson plans, games, videos, etc. for every subject.
ScienceNetLinks.com - Free science lessons and tools for K-12
ArtsEdge is the Kennedy Center's free digital resource for teaching and learning in, through and about the arts.
InventionAtPlay.org - Lemelson Center for the Study of Invention and Innovation.
Sciencemuseum.org.uk - Online learning materials from the Science Museum in London.
Bubbl.us - Free mind-mapping tools.