The Physics Classroom
Physics Tutorials and Physics Multimedia. Must have for all physics teachers and students.
Science in the News
How Stuff Works
A wonderful site that looks at the science of the world around us.
Web Activities that look at the nature of life and the possibility for life on other planets.
Exploritorium: The Meuseam of Science, Art and Human Perception
A great resource for all things science. Has links to activities, science information, web applications and more.