I'm going to have to make a vote for a place not mentioned yet - Duck de Chine. A great, superior tasting duck, decent service and western management, and a very tasteful, elegant renovated decor. Other dishes were equally satifying and of high quality. Its located in part of the 1949 courtyard complex behind Pacific Century Place in Sanlitun.

It is more of a trendy, swanky place with proper western-quality service, and has the cooresponding price tag to go with it. Its one of the few places in Beijing where walking in wearing something less than at least a 'business casual' attire might be unappropriate. All around, it is a phenomenal duck (the special sauce preparation is quite tasty and neat to see) is a classier and trendier setting than other, more 'classic' duck restaurants such as Quanjude, Dadong and the like. In Beijing, like anywhere else, you get what you pay for.