National Geographic for Kids http://www.nationalgeographic.com/kids/
Gamequarium http://gamequarium.com/
Reading a-z http://www.readinga-z.com/index.php
Fun Brain http://www.funbrain.com/
Scholastic http://www2.scholastic.com/browse/learn.jsp
Learning Planet http://www.learningplanet.com/stu/index.asp?tab=0
Starfall http://www.starfall.com/
Kinderweb http://olc.spsd.sk.ca/de/resources/gradek-1/websites.html