Yes, work has begun on a slackbook 3.0! This is a complete re-write and should be available sometime in mid 2009. The new book is being written with vi in Docbook format. Complete instructions for building HTML and pdf versions of the book will also be provided at this site, along with any extra Slackware packages (and source code of course!) if any special tools not included in current versions of Slackware aren't included in Slackware.
This website is the home of the Revised Slackware Book Project (the project).
The regulars on alt.os.linux.slackware (a newsgroup) have been discussing the revision of "The Book", otherwise known as "Slackware Linux Essentials - The Official Guide To Slackware Linux", created by David Cantrell, Logan Johnson & Chris Lumens.
This website is the result of that project. So far it's been a long and grueling project with lots of struggles as we all have jobs and other volunteer work, and let's face it, documentation isn't fun. :^) All the content here is licensed with the Gnu General Public License version 2.
Should you be willing to contribute to this endeavor whether with your own personal writing or by pointing out errors and corrections, you can send me an e-mail at the address alan at lizella dot net (e-mail munged and not linked because spammers have been harvesting e-mails from here for some time).
Linux is a registered trademark of Linus Torvalds. Slackware is a registered trademark of Slackware Linux, Inc. and Patrick Volkerding.