If you go into a number of UK pubs these days, you will find Guinness and Guiness Extra Cold on offer, the Extra Cold Just goes through another cooler. I like the normal stuff and fail to see why anyone should want it colder but there must be a market for the other one.

Re the widget and Guiness, Guiness use nitrogen or a nitrogen mix in thier gas for draughts as opposed to CO2. This article gives some info on the widget.

Jon