According to the latest mozilla.org status update, support for synchronizing the Mozilla address book with PalmPilots and other PalmOS devices has just been checked into the code base for the upcoming Mozilla 1.2 release.
Let me just take one moment to say…
This is great news. This has been one of the big things that’s prevented people from switching over from Outlook. Maybe now those folks will give Moz a shot and see what they’ve been missing!