I just checked out Google Calendar, and I really like it. I think that Google could easily challenge Microsoft for the market of enterprise calendaring systems. (One reason that I don't like Exchange is because that it is implemented on top of email protocols. This causes problems especially when using a client other than Outlook.)
There are two related features that I would love to see from Google Caledar.
- Being able to subscribe to a ics caledar file. With this, from Google Calendar, you would be able to collorborate with people using iCal and Mozilla Calendar and Sunbird. (With the Mozilla products, you could also modify the calendar in Google Calendar.) I just found this setting.
- Being able to export an ics file from Google Calendar. This would allow you to import the calendar into those calendar programs. (With iCal, you would be able to use iSync to sync the calendar with your phones/PDAs) I just saw this post that mentions that this is already there.
Update: Since now the two things that I thought we missing, are there. I am definitely going to use this. I hope now that companies will start using this as their corporate calendaring systems.