Restaurant.com has a 99-hour sale that started at midnight PST. During the sale, you can get a $25 gift certificate for $1 or $1.25, depending on the restuarant. It's a great excuse to try some new restaurants. Just enter the promo code NINETY when checking out.
While the available Atlanta restaurants are primarily in the 'burbs or of the chain variety, there are certificates available for higher-end eats like Repast, Social and Dogwood. And heck, for $1 you're not out much even if you never get around to using the certificate (they're good for one year from purchase). Don't wait too long because gift certificates for popular spots may sell out.