Kathy
good links to physics sites suitable for secondary

Donald Simanek's Pages
A comprehensive, quality collection of links as well as Dr. Simanek's own collected opinions. Topics include physics, history of science, pseudoscience, hoaxes, writing, education, skepticisism, humor, and quotes. The page is over 300K to load.

Homework Helpers
Links to useful sites for many different science disciplines, including physics.