White House for Kids - Fun facts and interesting information about our government. http://www.whitehouse.gov/kids/whlife/index.html
Ask Dr. Math - a question and answer service for K-12 math students. An archive, searchable by level and topic. http://mathforum.org/dr.math/dr-math.html
Math Games! http://www.ct4me.net/math_resources.htm#Elementary&MiddleBasicMath
FunBrain - Interactive Educational Games for Kids http://www.funbrain.com/
NASA Spacelink - SpaceLink covers a wide range of NASA subjects. You can learn about new NASA projects and see impressive pictures of outer space. http://www.nasa.gov/audience/forstudents/k-4/index.html
Giggle Poetry http://www.gigglepoetry.com/
AAAMath - Practice your math facts online. http://www.aaamath.com/