Fact Monster http://www.factmonster.com/
National Geographic for Kids http://www.nationalgeographic.com/kids/
Yahooligans http://kids.yahoo.com/
Fun Brain http://www.funbrain.com/
Fun School http://funschool.kaboose.com/
Dr. Seuss' Seussville http://www.seussville.com/
PBS Kids http://pbskids.org/
Magic School Bus http://www.scholastic.com/magicschoolbus/games/home.htm
Reading Rainbow http://pbskids.org/readingrainbow/
Spelling City: a great spelling website! http://www.spellincity.com