Wow, really? I mean, not to crap on your advice, but I checked that out from my library recently and found it to be terribly vapid. It seemed like a whole lot of really vague, fluffy stuff and very little actual useful tools I could use. I read about half a dozen of the sections and then gave up in disgust. That was bad enough from a fiction writers' standpoint, but even worse from the standpoint of a setting designer for D&D. Most of what it's going on about would be irrelevent in a D&D environment.
As an aside, Terry Brooks just wrote the intro; a collection of other folks wrote the actual book.