When we were there in August we saw two different bounce back deals. One was for 40% off selected DVC resorts (OKW & SSR) and 30% off Deluxe resorts (I think it was the same discount for a moderate as well) and covered certain dates for the rest of 2009 and was a room only booking.
The other one covered free dining for next summer (August / September) and was a package price based on room / tickets and
DDP.
I depends on what type of deal your looking for and if the dates suit you or not. If they did and you know you were definitely going back it would be worth booking one as you could always cancel / modify if a better code or rate came out.
As for
DCL, they offer a discount for booking another cruise while still on board and the opinion seems to be that it's worth doing, even if you don't have another cruise planned as you can transfer the discount and any state room credit onto another booking.