Teacher's Hub http://teachershub.com/teaching/teaching.cfm
A collection of tools including rubric creators, assessment tools, and project creation tools. http://www.4teachers.org/
Free daily puzzles and a daily secret number. http://www.theproblemsite.com
Links to mathematical puzzles. http://dmoz.org/Science/Math/Recreations/Games_and_Puzzles/
World History http://edsitement.neh.gov/tab_lesson.asp?subcategory=32&grade=6-8+&Display=Display
Readers Theater http://www.readwritethink.org/lessons/lesson_view.asp?id=130
Boundries http://www.pbs.org/wgbh/aso/tryit/tectonics/convergent.html
Plate Tectonics http://www.seismo.unr.edu/ftp/pub/louie/class/100/plate-tectonics.html
Civilizations http://www.digonsite.com/links.html
Expeditions http://www.nationalgeographic.com/xpeditions/atlas/
CST questions released by the state. http://www.cde.ca.gov/ta/tg/sr/css05rtq.asp
Vocabulary Webs http://www.lakelandschools.org/EDTECH/Differentiation/ten.htm