Scribbles for Mac

From atebits:

Scribbles is a drawing tool for everyone. Whether you want to sketch a cartoon, draw a birthday card or jot down some design ideas, Scribbles can help bring your imagination to life. Scribbles is based around a groundbreaking core technology that allows the artist to break free of the restrictions that typical drawing apps mandate. You never have to pre-define the size of your canvas. You can zoom in to your drawings with unparalleled precision and Scribbles will magically re-render your art so you never encounter a jaggy edge or blocky pixel.