From allears.net.....I made mine yesterday for April.
DO I NEED ADVANCE RESERVATIONS?
The answer to that is yes and no. For most restaurants, Walt Disney World offers Advance Reservations. You are told to check in at the restaurant's podium at least 5-10 minutes prior to your seating time, and will receive the next available table for your party size. To find out more about Advance Reservations, read the FAQ. Make your Advance Reservations for Disney restaurants by calling 407-WDW-DINE (939-3463) 180 days in advance. Disney's Central Reservation Office, or CRO (407-W-DISNEY), can also make your Advance Reservations, as can Lobby Concierge at your Disney hotel. Phone lines open at 7 a.m. Eastern time. (Swan and Dolphin Restaurant reservations can also be made through WDW's Dining number at 407-WDW-DINE.)