in the new SM graveyard/cathedral you start the instance pull all the mobs around the "pile of corpses". once you pull the mobs "zombified corpses" will start spawning at about 1 for every 6-10 secs. you can just make a target macro /cast instant spell like what we are using moonfire. you can also once you kill all the mobs around the pile of corpses run out and reset the agro, when you do this the corpse will no longer auto agro and continue to respawn so you can just run around gather them up use and aoe then go afk come back and do it again. they do not drop loot.
after more testing it appears that only 7 will spawn at a single node then no more will spawn. so the best way is to NOT reset the agro and just use a /tar macro with an auto it program.
Happy exp farming and +rep