FasTracKids International
http://www.fastrackids.com

National Geographic Kids

http://kids.nationalgeographic.com/kids/

Discovery Kids

http://kids.discovery.com

Kids Games

http://www.kidsgames.org/

Play Kids Games

http://www.playkidsgames.com/

Yahoo! Kids

http://kids.yahoo.com/games/index

PBS Kids

http://pbskids.org/games