Four words: Linux powered keg fridge:
Since the first brew fan installed a tap on the spare fridge and stuffed a keg inside, one question has been paramount: "Who's been drinking all the beer?"
Mike Wakerly's keg fridge will tell you. It'll also estimate the drinker's blood alcohol level and post it to a Web page; log his consumption for the night, week or month (and cut him off if you like); and keep track of his tab. The Kegbot can even send you a text message when the beer supply runs low.
A CO2 keg fridge was the Holy Grail of my college years, but new ones were too expensive and we didn't have the raw materials/power tools to create one ourselves. Instead we made due with a 33-gallon trash can filled with ice and a CO2 dispenser rig my room-mate stole from the football stadium. The floor in my dorm closet nearly rotted through and my room-mate got arrested trying to return an empty cannister, but damn that beer was cold!