Isn't the 770's screen "palm-resistant", meaning that only something like fingernails will register?

In any case, if the Origami's screen isn't, it will be, at least at those screen sizes, a royal pain in the butt. I have recently acquired a Siemens SimPad, which also isn't palm-resistant (meaning that fingertips, palms and just about anything that touches the screen will register as input), and it is a lot more hassle to do handwriting on it than, say on my Fujitsu Stylistic. For one thing, I have to constantly be aware that my palm doesn't touch the screen, or I get a mighty case of the "jaggies" (that's Newton jargon for erratic pen input).