Push birthdays for your address book contacts to a Google calendar. Keeps things in sync as you change your address book.
I couldn't find anything free that did this. If I am missing something obvious that does this better please let me know!
- Start BirthdaySync
- Enter your user info (email@example.com/password/desired calendar name)
- Select enable sync
- Click Sync-Now to push the initial set of data to Google Calendar
- Quit the app - it will run as needed in the background