is a wonderful e-learning site and a fine example of great writing, information/instructional design, and a perfect use for shockwave.

ExploreLearning offers a catalog of modular, interactive simulations in math and science for teachers and students in grades 6-12. We call these simulations Gizmos. Gizmos are fun, easy to use, and flexible enough to support many different teaching styles and contexts. Our Gizmos are designed as supplemental curriculum materials that support state and national curriculum standards; in addition, Gizmos help teachers bring research-proven instructional strategies to their classrooms.

Found via a thread @ 37signals.