For clarity - I really am talking about glass that is insulated by a vacuum. Not glass that is insulated by replacing the air with another gas. The same principle that is used to make a thermos - evacuate as much air as possible between the two conductive mediums.
A thermos is vacuumed to 10^-6 torr. Vacuum insulated glass has a vacuum of 10^-4 torr. The bowing in the glass is overcome by placing tiny pillars of glass to separate the sheets of glass every couple inches.
Take a look at the following: http://www.greenbuildingadvisor.com/...ulated-windows
. I sent an email to Guardian and have been informed that this glass will not be in residential window production until early 2014 now.