The primary shift is one of thinking of the book as a process rather than artifact. We are moving from the culture of the book to the culture of booking. Our focus is no longer on the book, the noun, but on booking, the verb — on that continuous process of thinking, writing, editing, writing, sharing, editing, screening, writing, screening, sharing, thinking, writing — and so on that incidentally throws off books. Books, even ebooks, are by-products of the booking process.
This is, of course, not without its problems — Kelly mentions in passing how this new relationship is already allowing spammers to pollute the Kindle marketplace. (via John Tormey)