Comment on Calaboration

On Mac OS X v10.5+ instead of Calaboration you should use this guide:

http://www.google.com/support/calendar/bin/answer.py?hl=en&answer=99358#ical

This will set up iCal so it shows (all) your calendars from Google Calendar, you can then move items from your local calendars into Google Calendar and hide/remove your local ones.