We used the AAA discount on our room during our last visit to Disney World - in August 2005. In order to add the dining package you have to go through AAA. You cannot book a AAA package with dining through CRO. You also have to purchase a 1 day ticket for each person 3 and older staying in the room.
Even with the extra expense of adding the 1 day to the package, we felt like it was a good deal and we really enjoyed the trip.