ARCTOS I used the trial version, and it was nice & handy. Now, spending a bit of time w/google calendar & the iCal > Preferences > accounts > add account (+), I'm not sure where I see the value in this app at $25.00 US per computer.
Yes, the google calendars mean that you have to have a new account for each sub-calendar in google, but, I've saved myself $50.00, I still have security (my google calendars are not public). Hence the shorter stars. Yes, we all need to make a living, but, there are other options out there for those willing to spend the time.
I suppose I'd consider buying it if I didn't need a license for every computer - I need to pay bills too!
http://www.google.com/support/calendar/bin/answer.py?hl=en&answer=99358
(Version 2.1.7)