Lesson Plans, etc
http://www.sciencenetlinks.com/matrix.cfm
http://www.thinkfinity.org/MPSearch/Basic_Search.asp
Open Educational Resources Archive
http://www.archive.org/details/education
The Open Educational Resources Archive is a collection of educational content including coursework, study guides, exercises, and recorded lectures. It is meant for students, teachers, and self-learners at all levels.
Online Lessons to prepare for AP Exams
http://www.archive.org/details/ap_courses
Open University (United Kingdom)Â
http://www.open2.net/home.html
Reith Lectures
http://www.bbc.co.uk/radio4/reith/
BBC Schools
Discovery Channel Education
United Streaming
http://www.unitedstreaming.com/
Incredible Art Lessons
http://www.princetonol.com/groups/iad/lessons/lessons.html
Core Knowledge Foundation (E. D. Hirsch)
http://www.coreknowledge.org/CK/resrcs/lessons/index.htm
Math Worksheet generators/collections
http://themathworksheetsite.com/
http://www.superkids.com/aweb/tools/math/index.shtml
http://www.kutasoftware.com/free.html
http://www.mathsonline.co.uk/nonmembers/gamesroom/transform/transform.html