The idea is for a collaborative book as a wiki-style dynamic receptacle for shared useful information, using the group-mind.
Book: structured document publishing
A book is a set of pages tied together in sequence, perhaps with chapters, sections, subsections, and so on. You can use books for manuals, site resource guides, Frequently Asked Questions (FAQs), or whatever you'd like.
Members who have permission can create a book and write, review, modify, or rearrange the pages. Many users can work together on a book.
At the bottom of book pages, DrLife automatically provides links for moving to the previous page and the next, and a link labeled up that leads to the level above in the structure. A contents page is also automatically created.
When using the Book a menu appears that helps you find their way around inside your books. You see the menu only when viewing the book.
The "General Practice book" link takes you to the book. The "book navigation" block helps you move around inside your book.
You can also generate a printer-friendly display of a book page and all its subsections. You do this by selecting the link for printer-friendly version at the bottom of any book page.
When you edit a page or section, you can also move it to a different level in the hierarchy by changing the "parent" to which it belongs. So you can move things around however you like. You can also check for orphan pages (pages that have become disconnected from the rest of the book).
You can also be given permission to outline posts in books. Users with this permission can take any other type of existing content on your site and add it to a book. When viewing a post they'll see an outline tab, and by clicking it they'll come to an interface that lets them move the post into a book.