Fun and Games
http://www.tvokids.com/
http://pbskids.org/
http://www.funology.com/
http://www.funbrain.com/
Reading and Writing
http://www.starfall.com/
http://www.tumblebooks.com/tumblereadable/
Research and Useful Information
http://kids.britannica.com/
http://kids.yahoo.com/
http://kids.nationalgeographic.com/kids/
http://www.howstuffworks.com/
http://www.factmonster.com/
http://school.discoveryeducation.com/