Join the Denny's Rewards Club, all you do is fill out the form, located here:
You will get important information about new items at Denny's monthly printable coupons in your e-mail, along with birthday specials & a coupon for your sign-up anniversary! You can even add your children (12 & under) to your account for stuff for them too!!
I just got a coupon for a Purchase a turkey dinner, get a slice of pie free!