http://mac.develop3d.com/

not sure about that, but hey will cost 2.99, so I might get one.

Tools like SketchBook, ilovesketch and Autodesk's ilovesketch on steroids version, (see video here http://vimeo.com/2419011) will really make sense to me with the arrival of the MacTablet... Now all is left is MoI OSX version...Sorry I can help my self :)