I suppose if you have a job/life that requires you to keep up with dozens or hundreds of contacts and appointments, they may be useful, but I don't. I can keep all my appointments and contacts in my cell phone which is a much smaller and compact package to carry around.
I've heard PalmOS is the way to go, but I tend to like the WindowsCE ones. There seems to be more of a range of easily acquirable cool software for the WindowsCE ones.
That's about it for me. Happy hunting!
Wulf`gar
"Beware a bunny wearing a pancake beret...It's just good advice." - mapthis
"All I needed was MGB and Fanatic and I coulda died a happy woman." - Avendesora (speaking of aero and Wulf being in the same chat)