Inspired by the thread on the validity and feasibility of coupon usage, what about the sources of coupons? (I'm all about value!) Besides newspaper inserts (normally just a rare chain restaurant like Chevy's), the direct mailer coupon packs that have mostly household savings with a rare restaurant mixed in, maybe the food section of smaller newspapers and the Entertainment Book (which I have never purchased though have used the online plan for a short time), what are other good sources of restaurant coupons. I know this can be a somewhat regional subject. I also know of restaurant.com that provides $25 gift certificates for well under face value (but that isn't really a coupon).
Any other good sources of coupons or discounts for restaurants - perhaps a central site?