There is an easy way to view those library calendars on the iCal web site. Instead of subscribing, edit the URL and replace 'webcal' with 'http', and then remove the '.ics' from the end. For example, the US Holidays link on Apple's site looks like this to begin with:
webcal://ical.mac.com/ical/US32Holidays.icsChange it to this:
http://ical.mac.com/ical/US32HolidaysDo not add the .ics extension! Load that URL in your browser, and this will bring up the calendar just like any personal calendar. Nice when I am away from my mac stuck in PC hell!
Mac OS X Hints
http://hints.macworld.com/article.php?story=20020914093120372