The outland zones were awesome, especially Nagrand and Zangamarsh, but Howling Fjord is my favorite zone in the game now by far. The first time you take the boat in as alliance is epic. I feel Horde really get the short end of the stick there, neither of their two entry points to Northrend have an equivalent feel. I've been really impressed with how Blizzard has created such a fitting atmostphere for northrend. It blows the setting of any other MMO I've played away, even with the "Cartoony Graphics".