Transportation cards for busses and boats are what we are missing. On our next trip, we will be hunting these down! When you board any type of Walt Disney World transportation, ask the cast member for a transportation card. If they have any, they'll be happy to share! Don't get upset if they are out though!
Other trading cards we look forward to getting in the fall are the Sorcerers of the Magic Kingdom. All Ears has a great list of all the Sorcerer's cards you can collect while playing this interactive game throughout the park. Another interactive game that includes a map, but no cards, is A Pirate's Adventure in Adventureland. You can read more here at All Ears.
Another set of cards we have missed out on is the transportation cards with Timon and Pumba from The Lion King. We have received the safety book a few times, but we never got the trading cards. I'll be on the lookout for these as well next trip! :)
What trading cards are your favorite?