Hi there :) I'm proudly presenting this Mob trap ;D This device includes: Piston opening gates, spawn tower, a lava destructor and a gathering room and a nice Industrial-design.

All you have to do is to open the gates so the mobs will fall down to TeH HOle OF dEAth!!!. Watch them die as you eat your fluffy excellent cake. When you finally want their goodies, just climb down the ladder outside down to TEhH StoRAge ROom!!! Collect your stuff and use it. Sorry, the mob trap on the picture has seen better days and I don't care to repair it.

Endermen you know :S

Anyway, have fun ;D