this looks good though i actually have the 'bigger' version here. I'm guessing the one in the apple store is newer though.
This is the bigger brother of the software you used to get a demo of when you bought your wacom graphire. It's catering for manga drawers but has some nifty features for B&W comic artists.
As a side note I now have Ubuntu 8.04.1 at work (seeing my Vista Dell died - hardware issue not s/w) anyway, I installed my Graphire on it - gimp makes for a nice graphics program. Felt really nice.