$5 at Dunkin Donuts When You Use American Express

It seems that Dunkin Donuts has teamed up with American Express to offer card holders a new promotion.  For every four purchases you make at Dunkin Donuts using your American Express, you will get a $5 gift card.  You must enroll your American Express card in the Blue Savings Program Dining.

I'm not sure if this promotion alone would get me to open an American Express account, but if you already hold a card I recommend enrolling.