Go to this site Whataburger to sign up for the 12 days of Whataburger.
By signing up you'll receive an e-mail coupon for free food valid every other day until December 24th, 2009. It could be anything from a shake, to French fries, to a WhataburgerŽ. No purchase necessary.
I received my first e-mail coupon today. Day 1 is a free medium fry and the coupon is good on December 2nd only.
If the link doesn't work, just go to their main page and you'll see the icon to sign up.