The macaroons at Madeline (128 W. 23 b/w 6 and 7th) are unbelievable! They are the best macaroons I have had by far in the city. I have been thoroughly disappointed with Bouchon's macaroons-- which are stale and slightly soggy-- and also have run the the Fauchon's on the East Side (is it closed now?). Anyways, they are perfect! Just like Confiserie Sprüngli in Switzerland.
The best one that I had was vanilla. Pure and creamy, perfect texture. Macaroons are all about texture. I wish I could post a picture or something, but the edges are all crispy and the inside is slightly doughy. The buttercream or ganache was the perfect room temperature and instantly became liquid in my mouth.
I also had raspberry-blueberry, and the dark chocolate one had a much firmer cream inside (chocolate thickens up the filling, but good flavor!)
They have about fifteen flavors-- including, what I can think off the top of my head-- vanilla, dark chocolate, milk chocolate, raspberry, praline, nougat, raspberry-blueberry, lemon, pistachio, coconut-blood orange? They also have some interesting ones with apricot and bergamot, etc.
They are a little pricey at 2.50 a piece but completely worth it.