Syncing iCal with Google calendar under 10.4? Is it possible to sync iCal on Tiger with Google calendar? 

Upgrading to 10.5 isn't an option for my G5, but I'd love to be able to use iCal to access the years of calendar data I have on Google Calendar.
BusySync


  Google Calendar Synchronization — Sync iCal with Google Calendar for online read-write access to your calendars from any computer, anywhere.
  
  Requirements
  
  
  Mac OS X 10.4, or
  Mac OS X 10.5, or
  Mac OS X 10.6