Absolutely superb episode. GoT is one of the true treasures of new golden age of television. If it only had the scene between Sansa and Littlefinger it would have been one of the great shows of the series.
It is such an accomplishment for the two writers/producers I can't actually think of anything else that comes close except perhaps in film with The Lord of The Rings. One of my early fears was there would be no way they could keep such a large cast working for so many years and in so many different locations, and yet its been magnificent. Also their extending beyond Martin's work and creating new places and ideas really deserves all the credit they can get.