The Bounceback that was offered to all
Free Dining resort guests staying at a WDW resort last year (2007) during the Free Dining period (offer originally supposed to end to Free Dining guests on 9/28/07 like on expiration date on flyer, but was extended for bookings - not stays -until 10/12/07) was to be able to book the next years Free Dining (2008) a whole year ahead.
Guests had to put down a $200 deposit, and had to book before they checked out of the resort. That way you had first choice of the resort you wanted for the next year (could book any with FD availability), didn't have to wait until April the next year to book, and were
guaranteed Free Dining for the next year.
Here's what the flyer looked like (thanks to mickey2000):