For Alliance, you begin in Wildhammer Stronghold at Zorus the Judicator (37,56) with the quest A Ghost in the Machine. After completing that quest you will be lent a pair of Spectrecles for the quest Harbingers of Shadowmoon. Now you will be able to see the Shadowmoon Zealots wandering around Wildhammer Stronghold. This may be one of the easiest grinding spots in the game (after level six) on a pvp realm with power leveling, given it takes place exclusively inside your faction's stronghold.

 

It's almost like a get-out-of-gank reward for getting as far as level 67, like Blizzard's all “Here you go, your last three levels are cake - have fun!” I also received a an average of about 15 silver for each of them which is small potatoes even at pre-level 70, but given the large numbers of these mobs I was grinding it added up quite nicely. Well the cake is sweet, my friends, so enjoy it. or until you get bored out your mind grinding for power leveling. You can earn around seven gold for this quest at level 70. At level 69 I was receiving 1160 xp and 1092 xp (rested) for the levels 68 and 69 versions of these mobs respectively.

 

The trick to grinding these relatively easy yellow mobs from within your faction's stronghold is simple: after you've killed your allotted number of mobs for the quest requirement just keep killing them. You will not lose the Spectrecles or the ability to see these mobs with them until you speak with the quest-giver. So, once you turn in the quest for your power leveling, you will lose your spectrecles … and therefore you will no longer be able to grind them. So do not turn in the quest; wait until you are just 10,000 or so xp away from level 70. That way you will still get the benefit of the roughly 12,000 power leveling experience points for quest completion.