Through October 31, 2009, you can get two free kid's meals with every $6 adult purchase. More details here. Do note that children must be present in order to get the free kid's meals.
The first one million fans of T.G.I. Friday's on Facebook will get a coupon for a free burger which can be redeemed October 11-14, 2009.
Go here and become a fan and then go here and enter your email address to get the coupon. It appears this coupon will be emailed to you so be sure and enter an email address which you regularly check.
As of this morning, there are close to 700,000 fans so I'd recommend jumping on this one quickly!
Thanks, More Than Cents!