EDIT: It doesn’t look like this is available anymore.
If you drink any Coke products with regularity, you should consider signing up for My Coke Rewards and entering in the points found under the cap / inside the box. They can be redeemed for magazine subscriptions, coupons for free drinks, and various other prizes.
There’s currently a deal going on where you can also get 25 free points as well as a coupon for a free appetizer at T.G.I. Friday’s if you go to their Earn Points page and click on the TGIF logo. It’ll take you to a TGIF signup form for their Give Me More Stripes reward program and after you join, you’ll then be e-mailed a code worth 25 Coke points. Coupons for free drinks only cost 24 points, so basically you’re getting a free drink plus the free coupon that TGIF will send you for an appetizer.