Since the newest World of Warcraft expansion, Wrath of the Lich King, was released the need to farm for gold quickly is more essential than ever. The price of anything and everything, from gear, to mats, to mounts, has gone up in Northrend. The pricing players become accustomed to from the core game and Burning Crusade expansion is left behind at the borders of this chilly waste land. If you do not want to be the laughing stock of your guild you have to know where to farm for gold in Wrath of the Lich King.
A good spot to get started with gold farming in Wrath of the Lich King is the Howling Fjord. Daily quests can be a great source of gold if you have already reached the maximum level for the quest. The Howling Fjord has quests geared towards levels 70-72, so it is pretty low level for Northrend. This means that fairly early on you should be able to maximize the gold rewards for daily quests. Daily questing in this area can easily generate 200-300 gold an hour. It is certainly a lot easier than going back to Outland to try and farm for gold.
Venomspire in Dragonsblight is another excellent place to farm for gold in WotLK. Stomping hordes of humanoid mobs can be a great way to farm for gold because not only do the mobs drop gold, they also drop vendor trash and the occasional item good enough for the auction house. Well, this region has a coast line of camps that spawn humanoid mobs, and by the time you make it to the burning ship that marks the end, the first camp should be about ready to re spawn again. You can just rinse and repeat this as long as you want.