LaTeX is excellent for journal and technical book publishing and some other applications, but it was not designed for collaboration over the Web, and for full multiformat output.
BookType, and its predecessor Booki, are designed for collaborative authorship around the world and for multi-format output, including HTML, PDF, print-on-demand, and others. The original development was sponsored by FLOSS Manuals, http://www.flossmanuals.net/ which creates manuals for Free Software applications. I have worked on manuals with them for How to Bypass Internet Censorship (now available in Arabic, Farsi, Chinese, Russian, and more), Firefox, the Linux command line, mifos microfinance software, and more, and they have dozens of other titles. FLOSS Manuals also pioneered the Book Sprint, collaborative writing of manuals by 8 or 10 people (writers, subject-matter experts, editors, artists, tech admins) gathered in a room, and several others (particularly proofreaders) over the Web within a week. We did the Censorship book from Monday morning to Friday evening in a rented house in upstate New York, ordered copies from Lulu.com, and then went out for dinner. Pics available, such as https://plus.google.com/u/0/photos/102331710307773485600/albums/5634256041091466881/5634256041835752050
Since then I have become Program Manager for Replacing Textbooks at Sugar Labs, the Free Software and OER partner of One Laptop Per Child. The rationale for the program is that netbook and tablet computers such as the XO-3 cost much less than printed textbooks, and have many other advantages in any school system, but especially for poor children in developing countries. http://wiki.sugarlabs.org/go/Replacing_textbooks, http://booki.treehouse.su./ Our mission is to end poverty and the various other ills associated with it. This includes unnecessary disease, disability and death; oppression of the poor and minorities around the world; much of government corruption; and wars of oppression or plunder. Naturally, more is required than computers to accomplish all of this, but it cannot be done without giving every child unfettered access to information and to other people around the world. See, for example, http://www.tikkun.org/tikkundaily/2011/02/15/sharing-in-gaza/
Sugar Labs plans to host book replacements in every traditional school subject, and whatever else our students need, at every level of development in every language needed. I am currently working on an Algebra text where every math statement can be copied from the document and pasted into a software session to execute and if desired plot or graph. There are more than 100,000 other OER packages available at various other Web sites that we have listed. http://wiki.sugarlabs.org/go/Open_Education_Resources