Mike, you bring up a good point - there should not be a duplication of information already in this site, but rather links to it. Also my intent was perhaps more to provide information vs methods (which Alexander wrote up many). For example, it might tell you a vendor for wiper motor rebuilds vs how to rebuild your own wiper motor (which Alexander provided already).
Ray, the examples you cite are exactly the kind of thing I was thinking of and also point out that this will take an effort by many people for it to be comprehensive enough to be valuable.
Alistair, the idea of it being password protected is interesting. Off the top of my head, I don't know if its technically feasible.