Doug, I go directly to photoshop, but the iPad would still solve the problem. I think it's probably more $$$ than I can rationalize for the problem at hand, which is just being able to see the results of shooting outdoors. But it is tempting. Very tempting.
David, that's a pretty interesting gadget, do you know if it will allow you to connect directly to a camera and download JPGs? The price is right, I've been considering a low-tech solution (Hoodman Hoodloupe) just so I can check exposure, but the PhotoBook isn't that much more expensive...