So, I just downloaded the 2011 Sketchbook Pro...and man, it's freakin' awesome! Only $59, and it's a major upgrade. Still lacks the breadth of Photoshop obviously, but for sketching, it's much more intuitive and sensitive to tablet movement. This recent update has added things like layer styles, text, and my tool of the week 'symmetry'...hence spaceships
Maybe someday I'll paint the others....