These website are fun AND educational.

www.funbrain.com
www.starfall.com
www.iknowthat.com
www.scholastic.com/magicschoolbus/index.htm
www.funology.com
www.coolmath4kids.com
www.aplusmath.com
www.aaamath.com
www.coolmath.com
www.curiousmath.com
www.dinosauria.com/
www.amnh.org/
www.discovery.com/
www.sciencenews.org/
www.awesomelibrary.org/social.html