Finally got my Palm data in.
Installed Palm desktop on my mac (I normally sync w/ my PC) and synced.
ISync kicked in and brought it into iCal.
GPE rejected that ical without comment.
I eventually gave up and uninstalled it.
Installed dual boot and KDE on my N810.
Korganizer mported the ical file fom the mac without complaint.
Copied KOrganizer's ical file to the SD card.
Reinstalled GPE.
Imported the Korganizer ical.

It's pretty slow once you get a lot of events in there,
but at least it works well enough so I can evaluate it.

Are there any other config entries available, files to edit or whatever?
I'd like to change the alarm sound, for instance.