My wife and I use Google Apps for our home email domain, as well as basic calendaring, etc. Today I found out that Google Calendar supports CalDAV!

By following these instructions (below), I was able to set up both of our calendars in iCal – now we have enterprise-class calendar sharing between our Macs. (OSX 10.5 Leopard required)

Google Calendar CalDAV support – Calendar Help Center.

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1. How to read your Google Apps email in your feed reader using the Atom feed