A year ago, or something like that, I downloaded GTD and outlook pdf from the David Allen Company... I was curious. So I now use a combination of a GTD system, with some traces of Covey and Rodger Constandse (Achieve Planner, Effexis Software). The syncing with my palm, using Outlook categories + priorities goes pretty smoothly, I find.
I can have my appointments + todos + contacts + some basic notetaking application with me all the time, in my pocket, without needing to carry a computer, paper, etc.
Buying a palm was probably my greatest technological move in the last 2-3 years. It takes a bit of time getting used to it. But once you have a system that works, it's just great.
PS : I could share my system with you if you want... But not now : I have to many things to do... In couple of days... Only if you ask