ABCYA - This free website is loaded with some nice educational games.
Sesame Street - One of the leaders in educational programming for children. I started watching Sesame Street on television when I was six years old.
E-learning for kids - This website provides a free primary education for children around the world. Math, science, computer skills, language skills, etc. Very ambitious!
PBS Kids - Between the Lions - This is a page for children who want to practice their reading. Video or audio can be downloaded and played offline. Requires some computer knowledge for downloading files.
Rong-Chang - English for Children. This page features easy reading exercises that children may listen to as they read. Very nice. The website has many other pages that were created for children.