Check out the science literacy maps.
The Science Spot Classroom. Fun chemistry labs and activities.
The chemical thesaurus, reaction database.
The Chem Collective. Virtual chemistry labs, tutorials, simulations, and situations.
Steve Marsden's chemistry resources. Demos, labs, powerpoints, and lessons.
ACS inquiry activities. Geared toward younger groups.
PhET. Online chemistry, physics, and biology interactive simulations. Complete with lesson plans. Excellent quality and highly interactive.
National Science Digital Library. Links to lots of online activities and resources for science education. Includes national benchmarks and standards plus interactive concept maps.
Check out the science literacy maps.
Teacher's Domain. All science disciplines, labs, activities, simulations, lesson plans, controversial science topics.
Federal Resources for Education Excellence. Chemistry, biology, earth science, physics. Lots of excellent resources, links, labs, and activities.
Exploratorium.com. Science of cooking. Lots of chemistry and biology applicability.
Science teahcer's resource center. Chemistry, physics, biology. Labs, activities, and instructional tips.
Nancy Clark's science teacher resource page. Labs, lessons, tips, and activities for biology and chemistry teachers. Excellent!
Chemistry Now -- Describes the chemistry of everyday materials, such as chocolate, cheeseburgers, and safety class.