Nothing pre-designed comes to mind. However, if you have any programming ability and access to a subscription service like mailman that supports cron jobs, then you can automate the mailling list through mailman and setup a custom cron job to automatically run a process (like sending birthday cards to everyone with a birthday that day).
Not an easy thing to do. There would be several steps:
- Create a way to collect everyones birthdays when they sign up for the list and store it in a database of some sort
- Setup the cron job
- Setup a means for the cron job to get the info from the database
I had to do something similar for a client that send out an enewsletter every month to the subscriberbase. Only thing is that every month the email went to everyone on the list (much simpler than what you're trying to do).
Possible, just not easy. If you do find something pre-designed, I'd love to hear about it 
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