Idk if anyone still cares, or if anyone has actually picked this idea up, but I am officially starting an NPC village constructing / automation plugin (inspired by Millenaire). Development name is "CityScape", and you can follow our progress here or on our bukkitdev page here: http://dev.bukkit.org/server-mods/city-scape/ We will be actively releasing snippets of testable plugin available. Right now we have a simple test plugin availabe (or at least it should be) that is a proof of concept for essential NPC AI. NPC's will walk to blocks placed by players, and will look at players within 4 blocks of the NPC. These are both integral aspects for NPC automation and human interaction.