It seems they're having some troubles with it... :/

http://img122.imageshack.us/img122/3840/googlecalendardirectorypi6.jpg

And they've changed " Add Calendar to your Desktop " to " Add Calendar to your iGoogle Hompage "

"Add Calendar to " cycles through iGoogle, toolbar, and desktop

In facts, it's no more than "Google Events". They just do a little directory.

Ah well, another rapid shot from Google. And this time far away from Bull's Eye. Checked some of the Holiday's calendars from different countries. Please, don't use them! They are unreliable.
The Danish one, which I would know best, had only Christmas, New Year and Ascension Day noted. It's missing about 10 to 15 more holidays. So.... Maybe it'll be better. For now: Come again, Google. It's a brilliant idea, but....
You'd be surprised to come to Denmark June 5th, and see all shops closed because of Constitution Day, which is not noted in the Calenda. Like Easter, May 1st (Labour Day) etc. etc.