It seems that the new WotLK boat routes for the Alliance are a bit confusing to everyone who just picked up Wrath of the Lich King. We’re going to clear up some things for you all here. There are two boats to get to Northrend. One is in Stormwind and it takes you to Valiance Keep in Borean Tundra. The second is in Menethil Harbor and it’s the boat that used to take you to Auberdine. It now takes you to Valgarde in Howling Fjord.
Both areas offer you leveling from 68+ and each holds a set of instances. Borean Tundra offers The Nexus and Howling Fjord offers Utgarde Keep. There are more instances, but those are just the starting, low level ones. I hope this information will help to clear up some confusion for people starting out. If you find one area to be too packed, you can always go to the other.