I've had my experiences with Photoshop brushes, Illustrator brushes, and Paint Shop Pro brushes. I've even used a drawing tablet in each of them, but I always ended up being disappointed with the ability for those programs to have the same kind of natural feel as a basic pen or pencil. Then I came across LiveBrush. If you like to draw smooth, flowing, brush-like images, you've GOT to check out LiveBrush. Check it out here: http://livebrush.com