iCal Update 1.5.5 and MenuCalendarClock iCal Edition

If you're installing the iCal 1.5.5 update (available now via Software Update) and you're running MenuCalendarClock you'll want to quit MenuCalendarClock before attempting the install. Otherwise the iCal update will repeatedly ask you to quit iCal, though it may not appear that you have iCal running at the time.