Do you have an iPhone? You wanted to use your personal calenders in the iPhone Calender? With iPhone 3.0, that was released two weeks ago, it is possible to add Google Calenders and keep them into sync, like for example the birthday’s of your friends and family.
Here is how:
Go to: Settings> Mail, Contacts, Calendars> Add Account> Other> Add CalDAV Account>
Type the following:
Note: if you are trying to sync a secondary calendar like i have for my friends birthdays and my work and private calender, use this URL
Server: https://www.google.com/calendar/dav/[string of numbers and letters]@group.calendar.google.com/user/
password: your google password
Good luck and a happy calender to you!!