They are even taking submissions. The "singles" will be books with a length between long articles and short books (something like 10,000 to 30,000 words), and will of course be cheaper than ordinary books.
The Ars Technica article about this comments: "Anyone who has ever read a terrible "business" or "self-help" book consisting of a single idea furiously puffed up into 200 pages of pabulum will no doubt agree with this sentiment."
Yep, no kidding. A great many books could be reduced to article length with hardly any loss.
... Aaaaaand of course, some people's immediate reaction is to use the idea the opposite way: They take their existing business book, on Sales of course, and sell each chapter as a book! Oh, come on.
By the way, read this Engadget post on the subject. Man. "If I sound really sarcastic about everything, everybody will think I'm so smart".