I have to give Sony points for making a tablet that is decidedly NOT tablet shaped. But the dual screens seem a bit small, and I cannot tell whether the form factor is just a novelty or actually a useful design. You can read about it (and its more standard shaped counterpart the "Tablet S") from Computerworld here, or read about the "Tablet P" and watch a - for some reason silent - demo video from Engadget here.
