I don't like hardback books.
They're too bulky, too heavy, and the dustjackets rip easily. I want a book I can shove in the already-crammed pocket of my laptop bag and read on the train. Paperbacks meet the need, and they're cheaper too!
The only thing the hardbacks have going for them is that they're available first, when the publicity hits. So what I want is some kind of application that I can notify when I hear about an interesting book, and which will let me know when the paperback comes out.
This one that Tim Worstall has picked up a review of would be a first choice: "Why Most Things Fail" by Paul Ormerod.
On a related note, "Freakonomics" is just out in paperback.