Google Calendar adds holidays and contact birthdays  

Google Calendar has added a few new options to the 'add calendars' section. When you select 'browse interesting calendars,' you'll see the option to add public and religious holidays. There's also a new Sports section, and if you click the 'More' tab you'll see an option to add the birthdays of contacts in your Google address book :-)

The beauty of Google Calendar is that each of these items is added as a separate calendar. If you want to see your personal appointments without all the clutter, then just unselect the sports, holiday, and birthday calendars in your sidebar temporarily to make those appointments disappear.