saw9000, I agree. Also, I think the current PDA devices are not mass-market ready yet. They are expensive, use a lot of a battery, and the LCD displays don't work very well in bright rooms or outside environments.
What I hope will be a breakthrough is E-Ink
as an alternative to LCD. First working prototypes are already out and look very promising. First market products could debut within the next two years. ZDNet
has some more info.