Everything you need to know... but didn't know to ask.

[schlumpy]

I found this awesome, independent website that has breen a great resource in my window shopping. It has everything from a window selection tool, a very thorough glossary, window technology page and individual state resources and much much more. You can visit it at:
http://www.efficientwindows.org/index.cfm

I actually feel I have the upper-hand for the first time since beginning to search for replacement windows.

[Window4U (IL)]

You could have found it on this site too. It's listed on the Home Page as a point of interest.