(Sample link) White House for Kids http://www.whitehouse.gov/kids/whlife/index.html
(Sample link) National Geographic for Kids http://www.nationalgeographic.com/kids/
FunBrain http://www.funbrain.com
kids's Place - Houghton Mifflin Reading Site http://www.eduplace.com/kids/hmr05/
Words http://www.wordcentral.com
Math & Reading http://www.mathstories.com
Math http://www.coolmath4kids.com