White House for Kids http://www.whitehouse.gov/kids/whlife/index.html
National Geographic for Kids http://www.nationalgeographic.com/kids/
Fun games http://www.funbrain.com
Resource for math and science (click on kid zone) http://www.sciencespot.net
Math Flash cards http://www.edu4kids.com/index.php?TB=2&page=12
Check out these fun math games http://math.rice.edu/~lanius/Lessons/index.html