Great ideas. I do something similar -- I've got Word docs for each of my Vista, Windows 7, and Windows 8: tips, advice, urls for useful websites, problem solutions, etc. Each file is a one-stop-shop, for example, my Windows 7 file is up to 282 pages, as of today --- with everything in alphabetical order (and cross-referenced when necessary) --- Also each heading is in CAPS, BOLD + IN COLOR, so I can pretty much find any topic in a few seconds.
PS I also make at least one copy of each of these files --- cause if they get corrupted or lost, I would pretty much pull my hair out!!!