Physics Lesson Plans, from the SMILE Project - Almost 200 lesson plans, grouped by physics topic. Also, math lesson plans are on the same page. - http://www.iit.edu/~smile/physinde.html
Brockport High School Physics Labs - Nearly 40 lab experiments which could be used as demonstrations or ready-to-go labs. - http://www.frontiernet.net/~jlkeefer/phys_labs.html
Morgan Park High School Course Materials - AP physics course outline, lab manual and lesson plans. Honors and regular physics lesson plans and course outlines. Computer physics course outline and lesson plans. - http://www.iit.edu/~rcoleman/physics.html
Practical High School Physics Lessons - Useful applications of physics knowledge. Basic and advanced discussions of fairly common questions which can be addressed by physics considerations. - http://mb-soft.com/public/phys0.html
Physics Problems - From basic to advanced topics, problems and topics graded by difficulty. From the University of Oregon. - http://zebu.uoregon.edu/~probs/probm.html
How Far Does Light Go? - A project which engages students in an examination of the scientific properties of light by engaging them with relevant evidence from the web. It culminates in an informal classroom debate. - http://kie.berkeley.edu/KIE/web/hf-description.html
Educational Resources in Physics, Astronomy, and Related Fields - A combination of lesson plan sites and useful science links, from Sonoma State University. Well worth the time to visit. - http://www.phys-astro.sonoma.edu/people/faculty/tenn/Educational.html