C-SPAN in the classroom. Excellent resources, especially good coverage of government, elections, civics, history. Worksheets, video, audio and activities.
The Smithsonian education section includes lesson plans, professional development information, and links to all of the Smithsonian museum websites.
Muddy River Media is a non-profit mission society which provides free media resources for churches. They offer media such as:
Illustrative Videos, Small Group Videos and talk sheets, Motion Backgrounds, Life Story Videos, Countdown Timers, Stock Photographs and Illustrations
They request donations, but the media is free.
Free 8 unit tutorial for K-12 teachers using PowerPoint.
Links to other free presentation software and tutorials.
Microsoft offers specific resources for educators. Find a range of free educational resources, grant and scholarship information, lesson plans and more.