(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/
(Sample link) Fun activities - by girls....for girls. http://www.missoandfriends.com/
Fun/Semi-Educational Games by subject http://www.funbrain.com
Learning Games http://www.pbs.org
Learning games and links to multiple sites - excellent! http://www.infohio.org/ER/ERk-5.asp
Gamequarium has a large amount of games for all subjects. http://www.gamequarium.com/