The Kids Know It Network is full of educational interactive games and movies intended for elementary school students. The Kids Know It Network hosts a number of animated videos explaining and demonstrating concepts from math, science, geography, and English. Each video starts with an introduction to a topic and is followed by a quiz. If a student gets less than 80% of the items correct they are prompted to start the video again.
The Kids Know It Network has a lot of good activities and videos for elementary school students. The only complaint I can see some teachers or administrators making regards the placement of advertising links on the website. The placement of some of the advertising disrupts the continuity of some pages.