One of the best things that you can do to get lots of restaurant coupons is to join every club available for any restaurant you can think of. I would recommend creating a separate email account just for your couponing fun because you will get overloaded with coupons in your regular email if you don't!
Here are some places that offer coupons in the Triad NC area (more than just restaurants too!)-
You can also purchase $25 Gift Certificates for as low as $2 from Restaurant.com with a special code word you can find in this picture!
These certificates are great to give as gifts, giveaways at your next PTA, activity, or social gathering.
Another great resource for when you are going out to eat is a site called My Kids Eat Free.
You can look in any state, on any day, and find where kids can eat for FREE!
I recommend to call and confirm before going.