Google Calendar is hot. I've posted in my tech blog that it's giving me geek goosebumps. A recent discovery, however, pushed it over the edge into this blog.
The XML URL for Google Calendar is a Feed. I now have a private bloglines entry that simply shows updates or changes to calendar events. Now, when my wife updates an event in the family calendar, my bloglines web-client RSS reader will display the updated event. This works even for a non-shared private calendar.
To find the feed url, click on 'manage calendars', a subtle link on screen left (anatomic right). Then click the calendar name you want to manage. (I have two calendars: Personal and Family. I can view them separately or as an integrated calendar. My wife can edit the Family calendar and view my personal calendar.)
You'll see Calendar Details. Click the XML button for the private address. A URL pops up with the helpful note that "you can copy and paste this into any feed reader". It works as advertised. Now bloglines shows the entries I haven't seen yet, and it only shows changes. If I'm logged in and I click on the header for an 'article' I get the details of the event for editing.
Then there's the tight integration with Gmail, the parsing of mail to create events, the natural language processing, etc. I've even momentarily stopped hating Google for letting Blogger fester ...
PS. Privacy? Surely you jest. Privacy is sooo 20th century.