Let's get started. Educating students about physics is hard. There are many unfamiliar notions and even familiar concepts are put on a new, more rigorous footing.
Experiments are essential, and demonstrations are useful.
In that spirit, there are a number of sites around the Internet that are collecting short physics videos, even interactive animations, based on browser plug-in technology. Robert has put a number of .avi movie files into the public domain. This is quite a hodgepodge of movies, covering everything from an Apollo rocket launch to the Trinity atomic bomb test. In between are plenty of classical motion and wave motion videos. Other sites with movies that specialize in certain topics also exist.