Book Adventure is a free reading motivation program for children in grades K-8. Children take multiple choice quizzes on books they've read offline and earn points for prizes. http://www.bookadventure.com
Learn to read at Starfall - teaching comprehension and phonics. http://www.starfall.com
Fun activities and great educational resources based on the educational program Between the Lions. http://www.pbskids.org/lions
An amusement park of math and more - especially designed for fun, fun, fun! http://www.coolmath4kids.com
Students receive direct reinforcement of classroom math and reading lessons based on the Scott Foresman, Silver Burdett Ginn, and Prentice Hall textbooks. http://www.kz.com
Math games, reading and other activities for elementary education. http://www.toonuniversity.com
Something for everyone. http://www.education.com
Weekly Reader's web site - current articles and information for health, science and social studies. http://www.weeklyreader.com
World Wildlife Fund has games, quizzes, and information on animals. http://www.worldwildlife.org/fun/kids.cfm
Visit the Sandiego Zoo. http://www.sandiegozoo.com
Practical, interactive curriculum loaded with activities. http://www.colgatebsbf.com