The first "opener" in The World is Open, is the growing availability of information on the web and the fact that much of this information is completely accessible without subscribing to the material, enrolling in a course, and so forth. In short, the content is available and accessible.
In this chapter Bonk highlights the increased availability of books noting the efforts by Google to scan in books and other projects such as the Open Content Alliance and Open Library that are working to make more books available to people on the Web.
He also highlights efforts to create free open-source textbooks such as those developed by the Global Text Project.
This is truly a revolutionary aspect of the Web as more content becomes available each day. This is a powerful foundation on which to create educational and learning opportunities.