I have been using Google Calendar for a while for my personal calendars and have been using them through iCal. Google’s instructions on how to set that up is to use Webdav and to enter the following url: https://www.google.com/calendar/dav/[your Google Calendar ID]/events.
I recently setup a Google Apps account and am starting to use it for email and calendar. I tried for over an hour last night to try and get my calendar working and it just won’t work. I’ve tried using the url above, and I’ve also tried using this url that some other people suggested: https://www.google.com/calendar/dav/[your Google Calendar ID]/user. This still doesn’t work for me either.
It seems that there are numerous other people out there that are having the same issue, but I haven’t found an answer yet. If anyone knows how to fix this problem, please let me know!