In the world of the Internet everyone has moved away from sending the personal greeting card to their clients, family and friends. If this is you or your client, start small and build the database you have and start calling everyone. Leave a message and ask them to either call you back or email you their birthday.
Everyone loves to tell others when their birthday is, so start now and build your birthday list for 2009!
BTW, when is your birthday? Mine? 6/2 - :D