PhET Colorado Simulations is aimed towards college-level and high school physics students and includes interactive simulations on many different physics topics.
Physics Flashlets is another informative website that has simulations for various topics in physics.
Khan Academy has many example videos of problems in physics. This is a great tool to brush up on your understanding of physics topics.
Physics Lessons is a great tool to practice physics and has problem sets, chapter reviews, and animations in physics.
Brightstorm has online physics video lessons to help students understand critical physics concepts so they can improve test and quiz scores and more easily complete homework assignments.
Regents Exam Prep has reviews, study-aids and problem sets in various physics topics.