Summary: Safari Flow represents a move to Every Page is Page One navigation for books, but its success is limited when the content is not written in Every Page is Page One style.
At Tom Johnson’s suggestion, I have recently subscribed to Safari Flow. Safari Flow is a new take on the Safari Books Online concept which allows you to rent online access to a large library of technical books. What makes Safari Flow different? Essentially, it takes an Every Page is Page One approach to the navigation of the content it provides.