Here are some links to fun educational sites:
SCRATCH Scratch is a free programming language for kids, developed at the MIT Media Lab, that makes it easy to create your own interactive stories, animations, games, music, and art — and share your creations on the web. The program is free, can be downloaded, and the website has many support links and examples. It is intended especially for 8- to 16-year-olds, but younger children can work on Scratch projects with their parents or older siblings, and college students use Scratch in some introductory computer science classes.
PBS Kids Educational Games, Videos and Activities for Kids
The Exploratorium in San Francisco has a great interactive site.
Scholastic is a great educational web site.