Disney has started, as of May 5, a service that will get you and you luggage to your resort from the airport. You need to make reservations in advance. Then, you will be sent special luggage tags. When you arrive in Orlando, your bags are taken off the plane, loaded in a special truck, and delivered directly to your resort. You, when you get off your flight, will be directed to a special area where you will check-in with Disney personnel. You will then board a bus and taken to your resort. The bus holds about 57 people and will make up to 3-4 stops, based on who is going where. The resorts will most likely be grouped together by area. Then, when you are ready to leave WDW, you will take the MagicExpress back to the airport. If you are flying on one of the participating airlines (Delta, Song, United and a few others) you will be able to check you luggage and get your boarding pass at your resort, enabling you to go directly to security at the airport. If you are not using one of those airlines, you can still take the ME bus, but your luggage will go with you on the bus. Then you will have to check-in, as usual, at the airport and get your boarding passes.
At the moment it is a free service and should remain so for the duration of the birthday celebration...until maybe Nov '06.