Birthdaybook, the Applescript application that collects and reminds you of upcoming birthdays, has been updated (version 3.4), to correct some errors from the migration to a Universal Binary. It integrates with Address Book and iCal, and can generate lists to be printed out as well.
You can download it here
Birthdaybook 3.4 addresses an issue with Birthdaybook 3.3 not working on some systems with OS 10.3.9 or earlier. This was a problem with the new universal (intel/PPC) build style and has been fixed.