Minecraft Duplication Machine
So I think I found a bug/glitch when I was trying to make a new machine in SMP (multiplayer). To sum it up, this machine duplicates any item you place into it, even items that shouldn't stack upon themselves (i.e. picks, signs, etc…).
I made a YouTube Video here:
Check it out and I'll make a tutorial showing how to make this machine if I get enough views/likes!