This is a PHP script that reads a Palm Desktop (Tested with 4.1.4) datebook.dat file and comes up with a iCalendar format file for use in anything supporting RFC 2445. Download link is on the right hand side.
I have also written a decoder for address.dat, but nothing beyond putting birthdays on my google calendar has been done.
:: Tested with ::
Apple iCal 2.0.3,
Mozilla Sunbird 0.2RC2,
Sept 13th remaining issues
GoogleCalendar is anal about EXDATE like iCal is.
Sunbird 0.2RC2 doesn't wrapping long lines in the Note
Only two repeat methods are supported, '1st wednesday of every month' '$X $WeekDay of every month' and 'Repeat daily until DATE'