MysteryGuestInc.com
Several months ago, a friend told me about MysteryGuestInc.com (MGI). In a nutshell, restaurants hire MGI to provide feedback about the service, quality and atmosphere at there establishment. For this valuable feedback, MGI picks up your bill (at least a portion of it). It's a win/win situation for everyone involved. As a consumer, you get to dine out several times a year (4-6) and someone else picks up the majority of the bill.
I got my first call from MGI last night so my wife and I will be visiting a BBQ place called Smokey Bone's this weekend.