I couldn't live without my PocketPC. It synchs easily with Outlook, so it is SO easy to carry my contacts and schedule around with me all the time. I use it as a notepad when I don't have paper handy but need to write something down. It's got games for when I'm waiting with Gary at a Doctor's office... you can download books to read... (if you can deal with reading on a 3" screen
) It's got Word and Excel on it, so I can easily transport files that I need to synch at the office or need to reference during the day when I'm not at work/home.
You can get them with wireless chips so you can get your e-mail or surf the net.
And it's slim and small, so it slips into anything I'm carrying or a shirt pocket or something.
There are PDA phones - but I didn't want the cellphone, just the PDA.