(Sample link) White House for Kids http://www.whitehouse.gov/kids/whlife/index.html
(Sample link) National Geographic for Kids http://www.nationalgeographic.com/kids/
Yahooligans http://www.yahooligans.com
Scholastic News http://www.scholasticnews.com
Everyday Math http://www.everydaymath.com
Mysteries to solve http://www.kids.mysterynet.com