I've got a project percolating in my brain involving one or more books. It was with interest when I saw Dan Lyke's comment "Then again, I was sure that there was value in thin computer books, and nobody seems to be selling many of them. " over at Flutterby. He gave me some elaboration, along with another thread over there about Shovelware books and the technical book industry, which has a pointer to a nice article about the Thin Book movement