Networked Book
A networked book is an open book designed to be written, edited, and read in a networked environment. It is also a platform for social exchange, and is potentially linked to other books and other discussions.
URL = http://en.wikipedia.org/wiki/Networked_book
More Information
Check out the above-mentioned Wikipedia article.
Recent (2006) networked book initiatives are listed here at http://www.futureofthebook.org/blog/archives/2006/05/defining_the_networked_book_a.html