I occasionally do sound reinforcement for a non-profit arts-promoting organization. I used to play music before events, just to fill the dead air. Gave me an excuse to buy interesting CDs to play that fit with the events. After an event a while back, the organization got a nastygram from Re:Sound, telling them that per Tarriff 5 they must pay a *percentage of the gate* for events where recorded sound was used.
The result? No music is being played before events. No CDs being bought. No musicians being hired to play pre-show tunes. Lose all around.
I use it to keep track of appointments, keep addresses, make notes to myself, and to play games on to kill time while waiting for stuff. I also use it as a metronome and as a basic tone generator. I don't use it to read books on, to write or read emails, browse the web, etc.
Other important stuff is reliability (I'm on my 3rd Palm only because I've worn out the screens on them), pocketability (a netbook is way too big), and decent battery life. Handwriting recognition or Graffiti would be good.
I don't want a thing that is combined with a phone (got one) or a camera (got one). I don't care about color, Bluetooth, WiFi. I'd rather not be tied to a specific vendor for applications."