It USED to be the foie gras five ways...but, alas, it is no more.
The agnolotti are supposed to be one of their specialities, and I found it to be VERY GOOD, but not exceptional.
Every main dish I've had has been amazing. Appetizers/first courses are not really my favorite thing at Spago. Desserts, I like the one that is "butterscotch" something...