Here are a few links to other physics teaching websites:
The Intuitor Creative Learning Website has sections about nurturing gifted children,
good reasons for taking high school physics, a basic physics savvy quiz, a section on chess strategy,
a section on "insultingly stupid movie physics", and many other topics of interest.
Wolfgang Christian has a fascinating Physlets website with downloadable Java applets which display
moving diagrams and lend themselves to interactive instruction. For more info visit the Applets Resources site.
I particularly liked Melissa Dancy's interactive ray diagram exercises as described in THE PHYSICS TEACHER,Vol 40, November, 2002.
Some simple diagnostic/remedial tests (with solutions) in introductory physics can be found at
Bill Rachinger's site from Monash University in Australia.
C. Rod Nave of Georgia State University has created a web-based Hypercard physics text.
Many thanks to David Wu for correcting that link!
Karl Hahn has put together a fine calculus website: (I am very proud to say he is a former student of mine.)