I use one at work. It reads bar-codes, has net access, is an alarm clock, mileage tracker, low resolution camera, scheduler, phone-book, inmate tracker, parts catalog, and a whole bunch of other stuff.
400 mhz cpu, 128mb RAM, windows CE?, rubber covered metal case, leather holster.
About a grand each, our maintenance dept has 15 of them. They are tied into the Caver Moorehead preventative maintenance system we use.
They are one of those things that you wonder how you made it without one. The paperless office is cool and so far no one has become bored with them, the guys didn't resist the new tech as we thought they would.
Take 12 highly skilled maintenance mechanics with each having over 20 yrs experience in their respective fields, give them a portable computer, and you can expect some resistance. They were skeptical at first about being spied on, but quickly learned how to manipulate the data just like they did when we did it all on paper.