We've found a new favorite table-service restaurant in the Magic Kingdom - Liberty Tree Tavern in Liberty Square (just across from the Liberty Square Riverboat dock). This place is great, especially if (a) you love colonial theming (e.g., Colonial Williamsburg) and/or (b) you love delicious, Thanksgiving-style food. In our case, it's both!
Throw on an appetizer such as the Tavern Fried Cheese, and you're all set. In fact, we at there for lunch and were all set for the rest of the day. We HIGHLY recommend this restaurant. Both the food and atmosphere are great, and far surpass other Magic Kingdom table-service offerings such as Tony's Town Square.