Second Sight 3.5 as you may know has space in the Userlog for Birthday information. BirthdayGrabber reads your Userlog for the birthday information.
One little catch....
Second Sight 3.5 never asks a user for the above information (and a few other records). The enclosed NewUser.svy asks users for the following information and records it to the Userlog:
Voice Phone
Data Phone
Fax Phone
Telephone Number
Email Address
Birth Month
Birth Day
Birth Year
You can also modify this survey for your existing users to "fill in the blanks" in your records. Consult your Second Sight 3.5 manual for more information.
PLEASE make sure that your Userlog has at least one birthday for each month. BirthdayGrabber has provisions for no birthdays in a month, but I haven't tested them. With most Bulletin Board Systems having a base of 200 users or more, the chances of not having at least one birthday a month are....staggering.