Google yesterday announced that they have added a new feature to Google Calendar which they call Interesting Calendars. Currently three different types of these calendars are available, namely holidays, sport schedules and misc. Holiday calendars make it easier than ever to add holidays of a specific country automatically to the Google Calendar. Available are a few dozen countries including the United States, Germany, United Kingdom, France, Spain or India. This category includes Christian and Islamic holidays as well.
Check out Google Calendar to explore the new options for yourself.