Ruins of Ahn'Qiraj has 33 recorded NPCs for levels 55-63, listed by level with their type, reaction and how many different items they drop.
More lists: Items by Slot, Items by Quality, Items by Level, Spells by School, Spells by Class, Quests by Zone, Quests by Level, Objects by Zone, Zones by Region, Zones New in Forever, Dungeons by Level