White House for Kids http://www.whitehouse.gov/kids/whlife/index.html
National Geographic for Kids http://www.nationalgeographic.com/kids/
Time for kids http://www.timeforkids.com/TFK/
Brainquest http://www.brainquest.com/
Fun Brain http://www.funbrain.com
Mary Pope Osborne http://www.randomhouse.com/kids/magictreehouse/