Beginners may like How to Draw It - instruction on how to draw simplistic cartoon-style animals
Drawing Coach has a lot of cartoon-type instruction that kids of all ages might enjoy
This post has free art teacher resources - a lot of good information
Drawing Now has step-by-step guides to drawing things kids like - Manga, video game characters, super heroes, etc.
And of course there are a slew of videos on You Tube that will help you draw for free! Here is one on how to draw a realistic eye