Well, it isn't. It's just a big mess barfed up onto html. Some links are to elsewhere on the same site. Intermixed with those are links to some other site.
I'm not saying there isn't useful information there, or that her book sucks. I'm just saying her website is a poorly organized mess that makes it less useful unless you know exactly what you're looking for. For a USB newbie it'd just be a maze of links, all alike.