I read the review on EnWorld, and while it's a relatively good review, it seems to be from someone who hasn't seen an RPG supplement on this topic before. I own at least 4 of them, plus a bunch more on related topics (like the various Primal Order books), so my standards may be a bit higher--it has to be a particularly good book on world-creation. Now, mind you, it looks good so far--it covers both the basics and then some, at least as far as i can tell. How much detail is there? If i already know a fair bit about tectonics, and why deserts are where they are, and how distribution of land and water creates and affects weather patterns, and the predominant biomes of the world and why the occur where they occur, and so on, will this be old hat? Or does it go into enough detail to keep an old hand at this interested? I guess it's gotta go one better than a college text on the topic* to do me any good any more--not necessarily in depth, but in attitude: there are things that are *very* useful/important to consider when creating a new world that textbooks on studying an existing world never bother to touch. Not to mention magic: how much of the content is exploring the ramifications of magic on ecosystems? But, really, i hope you're familiar with Aria: Worlds' cause that one (plus the relevant stuff in Aria) really is an excellent measure of where i'm at--i know more than it does in some areas, and less in others.