You are asking for a book on "How to Create Art". Creating adventures whether published for the masses or by a DM with only one PC is artistry and I don't think a book can explain HOW to do that.
Yes a book can explain how to do that. There is one for what you call the `art' of adventure-creating in D&D and it's called the Dungeon Master's Guide. What I'm talking about is a more comprehensive book on adventure-creating. There are books for other kinds of `art', including painting and how to write, amongst a plethora of other topics. Surely the publishing houses considered them salable, or else they would not be in print. A book on adventure-creating for D&D would, I dare say, be desirable for many DMs. (Have a look at the numerous threads by DMs requesting adventure-creating advice and consider that players on the official WotC messageboards have requested such a product).
Wizards of the Coast will release their DMG II in June 2005, which includes advice on`Designing Adventures' and `Running Campaign Settings.' Although it does not focus entirely on `adventure-creating', which leaves the door open for another publisher to make such a product.
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