Over the past 10 days, I've had duck 5 times:

-Fat Duck
-Sky Fortune
-Yihe Ya Ju (NE corner of Ritan Park)
-Made in China
-Xiaowangfu (near Kerry Center)

(I've also been to pretty every restaurant we've discussed here in the past, but will focus on this group now.)

Of the 5, Made in China was the clear winner (for me... all of us have unique tastes, and I'm no duck expert), but the others were all quite good (i.e. would blow away the best duck in NYC by a country mile).