This looks cool, it’s the Guinness Surger. It’s an

electrical device with a small metal plate on it; you pour a little water onto the plate, put a pint of the special Guinness Draught Surger Beer in place and then turn the power on, sending ultrasonic pulses up through the beer to create the creamy head we all know and love.”

Bernard from Running With Bulls has some stuff about it. And there’s the Gizmodo post. Check out the official site for it to see it in action.