Math
Ask Dr. Math - by the Math Forum--lots of links to activities and answers
Reading
Scholastic- hundreds of links for students, parents, and teachers for ALL sorts of subjects and activities
PBS Kids - links to the shows and activities to go with each
Science
Exploratorium - by the San Francisco Museum of Science, Art, & Human Perception
Science Resources - K-8--lots of activities and links, an AWESOME site (except BEWARE of pop-ups)
Social Studies
National Geographic World- features maps, games, mazes, a geobee and much more (lots pertains to science, too)
Sports
ETC.
- This fun and interactive museum is located right in downtown Harrisonburg. Many of our grade levels have field trips there. Check it out.