NUD to iCal is a free utility that copies events from Now Up-to-Date to iCal. It will create a new calendar in iCal for each category in NUD and copy all events to it.
The NUD to iCal script will also allow you to convert your NUD data to BusyCal. Since iCal syncs with BusyCal via Sync Services, once the NUD calendar data has been transferred to iCal, it will instantly sync to BusyCal as well
