White House for Kids http://www.whitehouse.gov/kids/whlife/index.html
National Geographic for Kids http://www.nationalgeographic.com/kids/
FunBrain http://www.funbrain.com
Cactus Ranch Elementary http://www.roundrockisd.org\cactusranch
AAA Math: Great appropriate math activities http://www.aaamath.com
Math Fact Cafe (Can be used to make math worksheets) http://www.mathfactcafe.com