Right now, if you sign up for IHOP's birthday club, not only do you get free food on your birthday, but you get free food when you sign up! I went this morning and got my free Rooty Tooty Fresh and Fruity (copyright). You can also get a free item of the same or lesser value.
(This actually isn't my food, I borrowed a picture from the internet.)
Just go to ihop.com and click on the pancake revolution graphic on the right.