14 sites in K through 12
What Works Clearinghouse
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Established in 2002 by the U.S. Department of Education's Institute of Education Sciences to provide educators, policymakers, researchers, and the public with a central and trusted source of scientific evidence of what works in education.
http://www.whatworks.ed.gov/
ePALS Classroom Exchange
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Maintains a community of collaborative classrooms engaged in cross-cultural exchanges, project sharing and language learning. ePALS is also a provider of school-safe email, blogs, eMentoring and web-browsing technology for the global educational market.
http://www.epals.com/
Forum - Usenet k12.chat.teacher
See also
The category K through 12in other languages