http://free.ed.gov/
Free resources for educational excellence from the US government

http://www.pbs.org/teachers/
Featured resources from PBS

http://www.oercommons.org/
OER Commons-Open Education Resources

http://fcit.usf.edu/matrix/index.html
Technology Integration Matrix-illustrates how teachers can use technology to enhance learning for K-12 students

http://www.tpack.org/tpck/index.php?title=Main_Page
Technological Pedagogical Content Knowledge