a friend of mine teaches math to middle school kids, and she said that learning is like establishing small islands of information that you really understand, then after that you start linking them up and establishing understandings of systems.
i've found that to be true with mechanical stuff. in that way the site works pretty well, as you can do a search, get several takes on a problem or a procedure, they try it yourself, then go back and do more searches, etc.
i also keep a word document on the computer desktop, so if something really relevant to my bike gets posted i can copy it into the document. have to organize the document someday though.