Classroom Resources:

Interactive Science Simulations
Fun, interactive, research-based simulations of physical phenomena from the PhET project at the University of Colorado.  http://phet.colorado.edu/

Science Net Links
The AAAS site Providing resources for K-12 science educators, Science NetLinks is a guide to standards-based Internet experiences for students
http://www.sciencenetlinks.com/

Exploratorium:  the museum of science, art and human perception
Great teacher resources and links.
http://www.exploratorium.edu/who/educators/ 

Trade Books and Other Non-Fiction Text