We have been looking for a group calendar that would be flexible enough and easily compatible with most PC and mobile calendar standards. Looking at the Google Calendar beta, this seems to be not so far now. But, when I have now been trying to test it, the import function from Outlook seems not to be working. There are some others who face the same “Failed to upload ical/csv file” error when importing from iCal, too. Wonder if there is some obvious solution for this?
Edit: there appears to be so many bugs in Google Calendar at the moment, that some people would prefer to call it Alpha rather than Beta. See: http://groups.google.com/group/Google-Calendar-Help.