Aha! I was thinking along the same lines as gfair and kontheur (posts 194 and 195).
First, this is not meant to look pretty, it's just a quick mockup to help explain my idea. As in other's previous posts I agree in having the base as a multi-touch surface that is also the exact same size as the screen. I'm not saying an additional screen, but a surface that has multiple uses and the surface appearance changes depending on what you're doing. I've only shown keyboard mode in my mockup, but it could also show other things that you may not want cluttering up your screen such as a piano keyboard or turntables for example. It could also become completely blank in order to be a multi-touchpad for cursor operation or for drawing, with exact reference to the screen (since they're the same size). The surface could also include the "keystroke tactility arrangement" patent that skwoytek reminded us of in post 89 so you would know where the keys are without having to look down. Also it could just be black and white to keep things as simple as possible. One or both screens could be OLED.
One of the reasons I would really like to see something like this is for the drawing aspect. I get a bit leery when people say down with the stylus. To a point I can understand as it could maybe take away from the minimalism that is Apple design. But a lot of people attach a mouse to their notebooks/laptops don't they? A stylus is more minimalist than a mouse IMO. On top of that, aren't a lot of Mac users designers and artists? That's the impression I've always had, but maybe things have changed. Usually artists and at least some designers draw a lot. Fingers don't cut it when you want to draw, you need something with a fine tip if you want to do anything besides fingerpainting in your art programs. Besides, somebody needs to give Wacom a run for their money, and I think Apple could do it. I also think Apple could design a nice minimalist stylus and find a way to carry it with the computer far better than PC designs have done.
(Also check out LG's concept "e-book" from 2006
http://www.red-dot.sg/concept/porfolio/06/12pr/ebook.htm. There's another image of this online showing both screens going all the way to the edge since apparently you can do that with OLED.)
I know this was long, thanks for reading.