I guess that everyone on the planet now knows that Google has launched 
its CL2 web-based calendar.
Scott McNulty at TUAW has written an illustrated tutorial on how to share a calendar from Google Calendar with iCal.
It’s read-only subscription in iCal at the moment, but better integration will soon come.
Just don’t try it in Safari:
For the moment you’ll need to use Firefox (or one of that crowd) to get the best out of this service.
UPDATE: And high earth orbit shows you how to go the other way.
