There's this app I keep seeing advertised in Macworld, called
EazyDraw. The ad shows a very Clint Eastwood-looking character (in full spaghetti Western mode) saying "what are you waitin' for, DRAW!". Know the one I'm talking about?
It's OS X-native and seems to be not too complex, not too limited.
Has a free download demo, so would be easy for him to give it a "no strings" try?
I'm gonna download the demo and play around with it...