BrainPOP

http://www.brainpop.com/

Animated Educational Site:

I've gone through a few of the links and it contains animated movies to explain various topics related to Science, Math, Health, etc. Narrated by their animated duo Tim & Moby (a guy and a robot).

"BrainPOP is easy to use, safe and loved by teachers, parents and kids around the world. One of the best ways to get to know BrainPOP is to poke around for yourself! Explore the hundreds of BrainPOP, BrainPOP Jr. and BrainPOP en Espanol movies and activities for a few days and you'll discover the impact BrainPOP can have at school and at home."

This isn't a free site, though some of the movies are free and there is a free 5 day trial period so you can explore.