That is interesting. I used to use photoshop but since I've gotten Painter I've been using it for the bulk of my images and then going into Photoshop for post work. I usually create the image, and then adjust levels, brightness, and a slew of layer masks to spice areas up, etc. but yah, bulk of mine are done in painter.
I believe it's the Ryan Church gnomon workshop that I got with Painter X when I bought it. Though I haven't made it through the whole thing, the stuff I watched gave me a great start.

"Live life like a fantasy. Reality is only in your mind!" - Fabledgoat