Commercially available self cooling beer keg (Score 1)

A German company offers self cooling beer kegs since last year. I bought two of those myself for a birthday party which worked very well (45 min to cool down a 5 gallon keg to perfect drinking temp).
Clever technology - check it out:

Coolsystem

They used to provide one bavarian brewery (Tucherbrau - btw excellent beer)exclusively for quite some time but I think they started to bring it to the market already.