Here are some links to other physics or physics related sites. If you find a site that you like and think others would enjoy let me know and I will add it here.
A physics teacher from Glenbrook High School in Illinois started a website a long time ago that has turned into a huge resource for learning physics. There are a lot of online tutorials. If you are stuck trying to understand something, it is worth looking at what they have here. http://www.physicsclassroom.com
The University of Colorado has built up a pretty extensive collection of simulations for a variety of science topics. http://phet.colorado.edu/en/simulations/category/physics is the page of the physics simulations. These are all decent to excellent, and can be very helpful in trying to figure out relationships and key concepts in physics.
This is a site that I love. It has extensive biographies on mathematicians throughout history and from all over the world. It also has some nice summaries of historical issues. Most everyone that will ever be named in class has a page in here. http://www-groups.dcs.st-and.ac.uk/~history/
The American Institute of Physics. I figured I couldn't really be a physics teacher without referencing the AIP. The history section has some neat stuff, such as copies of historically important papers by American physicists. http://www.aip.org/history/
Here is a site on special relativity that some past students have liked. http://casa.colorado.edu/~ajsh/sr/sr.shtml