Fun Brain Fun and educational games http://www.funbrain.com/
PBS Kids http://pbskids.org/games/
Yahoo! Kids http://kids.yahoo.com/games
Kaboose http://funschool.kaboose.com/
The Fun Place to Learn! http://www.primarygames.com/
TechKNOWLEDGEy! http://4kids.org/games/
Scholastic for Kids http://www.scholastic.com/kids/stacks/games/