Shapefiles, KMZs, etc.

I am looking for shapefiles, KMZs, etc. for networks primarily in the Midwest, but really throughout the area that is the scope of this list. I am a small ISP that just happens to know more than your average ISP about where people are and how to use GIS tools. I use them to help other ISPs find transport and they may come in handy for some start-up IX work I'm involved with. They would not go public and I would be willing to sign NDAs to get them. I have gotten several form public sources, but I may not have gotten all of the public ones and I have some (but still only a few) private ones. Thank you. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com