Technology looks like it is shifting from PC centric to more specialized devices. I don't think PC's will disappear for a long time. Their general purpose and usability will keep them kicking for a long time. The hand held market is probably getting ready for fundamental shift. Smaller, but not too small devices will become more common.
Web phones are a bust, the screens are too small, and data entry, well, sucks.
The Palm OS will do well, but the prices really need to come down to convince more users. The size factor comes into play because the darn things wont fit in your pocket. That is just a little too thick for the average pocket. The others, like the Jordana are even worse. If you are going to have to carry something, the sub-notebooks are a much more useable alternative.