Dates to iCal automatically syncs your Address Book birthdays, anniversaries and custom dates to iCal, creating alarmed, editable events in a separate calendar. With Dates to iCal you can:
Add Address Book date events automatically to iCal.
Choose which event types you want added (birthdays, custom dates or both).
Have any type of alarm you like for the event, from a message to emailing a whole Address Book Group.
Choose the notice in days and hours the alarms are set for.
Manually make changes (i.e. adding notes) to these events.
Add birthdays manually for people you don't have a separate card for in Address Book.