Meanwhile, you can browse interactive maps of US antropogenic fossil fuel CO2 emissions based on the data produced by Project Vulcan at Purdue. Google Earth browser plugin is needed, or you can load all data in a KML file in Google Earth directly. There is also a flythrough video explaining the different data views. Full disclosure - I'm the programmer who created the maps. Yes, the page is slow to load, but once a layer is accessed, it'll stay cached.

I've been using for about a year a directory where I put a file named after each host I maintain. I and other admins add numbered entries about every non-trivial change we make, with timestamps. If there are machines with identical configuration, there is a file caled abcde.common that lists their common config. A wiki isn't a bad idea either, I guess.