White House for Kids http://www.whitehouse.gov/kids/whlife/index.html
National Geographic for Kids http://www.nationalgeographic.com/kids/
Read Think Write http://www.readwritethink.org/student_mat/index.asp
Fact Monster http://www.factmonster.com/
Math Facts http://home.indy.rr.com/lrobinson/mathfacts/mathfacts.html