White House for Kids http://www.whitehouse.gov/kids/whlife/index.html
National Geographic for Kids http://www.nationalgeographic.com/kids/
Various games and activities. Really COOL! http://www.netrover.com
Games from Between the Lions http://pbskids.org/lions/games/
Stories with corresponding online and printable actvities http://www.storyplace.org
Where children have fun learning to read! http://www.starfall.com/