White House for Kids http://www.whitehouse.gov/kids/whlife/index.html
National Geographic for Kids http://www.nationalgeographic.com/kids/
Practice your math facts here! http://www.factmonster.com
Another fun site to practice multiplication facts. http://www.multiplication.com
Get answers to your many questions on just about any topic. http://www.askforkids.com
http://www.cyberkids.com
http://www.funbrain.com
http://www.pbskids.org/go
http://www.KidsMemory.com
http://www.KidsKnowIt.com
http://www.KidsGamer.com
Mastery Club
Geometry Study Jams