From the National Endowment for the Humanities edsitement offers lesson plans for K-12 on anthropology, art history, civics, folklore, history, language, literature, mythology, religion, social studies, and writing.
The Khan Academy website offers a free online collection of more than 3,600 micro lectures via video tutorials stored on YouTube teaching mathematics, history, healthcare, medicine, finance, physics, chemistry, biology, astronomy, economics, cosmology, and organic chemistry, American civics, art history, macroeconomics, microeconomics, and computer science.
Webcast in five days, great resources to help celebrate Constitution Day and develop habits of citizenship in a new generation of Americans, presented by the National Constitution Center. Lesson Plans and Activities for Kids from the National Constitution Center.