http://www.teachablemoment.org/high.html
Teachers can find activities for grades K-12

http://www.bcps.org/offices/lis/models/highsp.html
Teaching tutorials

http://www.useekufind.com/tproject.htm

http://mathforum.org/library/levels/high
An Internet mathematics library

http://www.aapt.org/Policy/roleoflabs.cfm
The American Association of Physic Teachers

http://www.siec.k12.in.us/~west/proj/100th/act.htm
Suggested activities for celebrating the 100th day of school

http://www.education-world.com/a_lesson/lesson074.shtml
A lesson planning center; ice beakers; advanced teaching degrees