I think you could spend the rest of your life at this site. It contains links to just about anything pertaining to earth science. This site contains everything you could ever want to know about an atom. It is An Interactive Tour of the Inner Workings of the Atom and the Tools for Discovery. Here you can find facts and fiction about dinosaurs.
Students can win scholarships.
This is a great program, but it will require a lot of time and effort in order to integrate it into your classroom. This site deals with a modern approach to teaching math and science. If you are developing curriculum, this is the place to go. More than 2,000 World Wide Web resources related to earth science - updated weekly. This is a terrific resource.