Instead of "question", we would have "book" and instead of "answer", we would have "review". There might even be a way for Jeff and Joel to hook into Amazon so if someone uses books.stackoverflow.com to buy a book, they can be the referrer and get some money.
If this is a good idea and works well on SO, then maybe SF and SU can get their own books section too.
This was inspired by this question on SO.
EDIT: I should have clarified, but these would be books relating to the subject matter of StackOverflow (computer science, software engineering, programming), ServerFault (IT, system admin), and SuperUser (power user, software applications).