A quick note for those who are unaware of this fantastic site: Restaurant.com offers gift certificates to restaurants around the United States at a very discounted rate.
Check out Coupon Cabin to double your discount.
For $2-5 you can purchase a $25 gift certificate to great restaurants.
Usually there are some stipulations regarding minimum purchase, alcohol and days of the week during which the certificates can be used, but overall, a fantastic bargain! You should definitely check it out.