Let's not go overboard on windows, please. Check all the stats and you will see that even a Low-E replacement may only save $10 a year, and this for a $4-600 investment. We recently followed an auditor into a house after he diagnosed a cold bedroom as needing caulk around the window trim when it was a missing band joist in the floor where it cantilevered out into the front porch pent roof - really easy to spot from the street as you drive by and even easier to diagnose properly. And this auditor was both BPI and RESNET certified. Let's all agree that windows and receptacle gaskets mean nothing (with rare exceptions) and move on to the real problems.
Rick...you hit the nail on the head. BPI announced last fall that they were developing something for the EPA I believe...who is merging programs with DOE