Someone please make a paper-killer application. I love working with pen & ink because there are no distractions and the form factor is awesome for free thinking

Someone please make a paper-killer application. I love working with pen & ink because there are no distractions and the form factor is awesome for free thinking. I want those thoughts to get permanence. I'd love to be able to jump into a mini-drawing program as well. For app makers, I could see the tablet as an extremely fast prototyping tool. You could draw up a mockup, add some hooks for click through transitions, maybe some data entry. I could make a full application mock in 10 minutes. I know, I've done it before on paper, but with clumsy transitions (i.e. now look over at this other picture). Also, I've been colaboratively drawing with my 3 year old a lot. We just draw different parts of a big sheet. I'd love to do this on the go. In fact, I think this is a whole application class that is growing on the iphone: kids apps. The difference with the iPad is that they can be collaborative. The education apps will be awesome.