Yuckiest Site on the Internet -- If you like yucky, you'll like this site.  

SDNHM: Kids' Habitat -- Sharks, birds, reptiles, fish, fossils to mention just a few of the things to learn about on this site.  Also includes puzzles and games.  

GORP - Great Outdoor Recreation Pages -- National Parks, Forests, Wildlife, and other outdoor activities.

Brain Teasers -- This site is both fun and challenging.

A+ Math : Homework Helper -- Help with your math homework.

Cool Science for Curious Kids -- This site a must! Learn about air junk, caterpillars, plants, and more.

The White House for Kids -- 

IMAGERS - The Adventure of Echo the Bat -- The story of Echo's adventures.  How remote sensing data helps him unite with his mother.