White House for Kids http://www.whitehouse.gov/kids/whlife/index.html
National Geographic for Kids http://www.nationalgeographic.com/kids/
Egg2.com games. There are so many games on this website I do not even know where to begin. Check it out! http://www.egg2.com/
Puzzlemaker http://puzzlemaker.com/
FunBrain http://www.funbrain.com/