I have no idea if this is actually possible to code for SMP, but I would love to see a plugin to allow for you to make a setup like so: Chest 1->Furnace->Chest 2 Chest 1 contains smeltables and fuel, the furnace is auto loaded with materials from chest 1 and the output is deposited in Chest 2. (or maybe a chest 3 behind the furnace for the fuel?) Make the chests collect items on collide ala Minecart Mania chests picking up carts and you could have an automated smelting facility.