Right now at Restaurant.com, you can get a $25 gift certificate for $2 (normally $10, so 80% off) when you use code NAPKIN. You usually have to spend at least $35-$50, but it can make for a great deal. We have done this quite a few times and the restaurant is really nice because they want good reviews! Check it out if you want to try out a restaurant that is included.
Order through Ebates and get 15% back (which is $0.30) plus first-timers get $5. If you are ordering anyway, you may as well get the $0.30! We even tried out an Indian restaurant in New York City last summer and got some delicious food :)
(Ebates sends their money out quarterly by check or paypal, but you must have at least $5.01 before they send the money out-next quarter ends mid-August)