The first one that I've seen is nice and encouraging. It's a bit like your Grandpa teaching you to draw.
In this video he is basically summing up what I've been reading in Drawing From the Right Side of the Brain, but in a really nice easy way.
He's also explaining why we are doodling like this and I always think it's better when I know why I'm doing something. Otherwise we're all just one step away from becoming mindless simpletons, blindly obeying orders without question...