University of Colorado
University of Colorado: Physics 2000: Einstein's Legacy: Laptop Screens
A series of seven pages that describe how screen displays on laptop computers work using polarized light in a liquid crystal display. Interactive Java applets.
Exploratorium
Exploratorium: Online Exhibit: Mix and Match
A Shockwave movie which allows users to mix varying colors of light and observe the effect upon the appearance of a circle. Accompanied by a "To Do and Notice" section and a "What's Going On?" section. Excellent!