Paper has brilliant UI design
As a veteran of about 15 freehand note taking and drawing apps on the iPad and Android tablet, I can assure you nothing comes close to the new Paper app from a company called 53.
It's already been pretty well reviewed around the web today, and I can assure that it's worth the hype. The thing Paper does really
well is liberate you from the claustrophobia of rectangles that other apps seem to engender. Nothing is a grid or a pop-up. Everything is organic, but organized. http://www.fiftythree.com/paper