Buzz sent over this info from Mousesavers.com about cake ordering:
Special Occasion Cakes
Prices listed below are subject to change at any time.
You can order special cakes for delivery to your resort room or to be served after your meal at a Walt Disney World restaurant.
• Small decorated cakes (6"-8", serves 4-8 people) in chocolate or vanilla can be delivered to your room at any of the Disney Deluxe Resorts. The cost starts at $25 plus tax. The Grand Floridian offers more elaborate cakes at higher prices. Simply call In-Room Dining (room service) from your room phone after arrival.
• Small non-personalized decorated cakes (6", serves 4-6 people) can be arranged on arrival at all Disney World resort table-service restaurants. Simply ask when you check in at the podium. The cost is $25 plus tax.
• Personalized decorated cakes can be preordered to be served after your meal at most Disney World resort table-service restaurants. The cost is $25 plus tax for a 6" cake (serves 4), $30 plus tax for an 8" cake (serves about 8) or $45 plus tax for a 10" cake (serves about 16). Call (407) 827-2253 to make arrangements at least 48 hours in advance.
• For those with food allergies/restrictions, BabyCakes NYC in Downtown Disney (which offers vegan, gluten-free, wheat-free, soy-free, sugar-free, egg-free, casein-free and Kosher items) can deliver a 6-inch cake that serves 8-10 people to Walt Disney World restaurants. First, book an Advance Dining Reservation (ADR) at a Walt Disney World restaurant. Then call the bakery at (407) 938-9044 at least 7 days in advance and provide the ADR confirmation number, date and reservation time.
Hint: if you will have access to a car, order and pick up a decorated cake from Publix supermarket. The quality is excellent and the prices are much better than Disney's. They even have some Disney cake designs.
Lurkyloo and Tricia1972 have a thread on the restaurants board with more info and wonderful pictures:
http://www.disboards.com/showthread.php?t=2413710
CSR info from the Cake Thread:
Coronado Springs — 407-827-2253
Cake flavors are chocolate with chocolate mousse, strawberry shortcake, carrot cake (with 72 hours' notice), mixed berry, and Oreo cookie. Cake sizes are
4-person $20 square cake
5–8-person $30 rectangular cake
10-person $40 round cake
12–16-person $50 rectangular cake
Boardwalk Inn (Boardwalk Bakery):
BoardWalk Inn* — 407-939-2393
6-inch $21 chocolate cake with chocolate buttercream or vanilla cake with vanilla buttercream
8-inch $32 vanilla cake with white chocolate filling and frosting or chocolate cake with dark chocolate filling and frosting
10-inch $45 chocolate, vanilla, or marble cake; filling is vanilla or chocolate buttercream, white or dark chocolate mousse, strawberry mousse or raspberry mousse; frosting is vanilla or chocolate buttercream or whipped cream
Screen print costs $30
Mickey Mouse Cake $48 (serves 12): Vanilla or chocolate Mickey head-shaped cake with chocolate mousse filling, covered in chocolate ganache; only customization is writing on plate
Fancy, fondant-covered cakes start at $75; additional flavors may be available
Here is one of the mini cakes from the Boardwalk Bakery. There are links to several cakes (mini and otherwise) in the cake thread.