You may have noticed that since February 2011 there have been no updates to the free pdf’s. That is because we have been redesigning the docbook source code to accommodate smaller books (we call them minibooks). This mandates a rewrite of the build system and a refitting of the .xml files and directories. This is all being done in the git experimental branch.
We take the minibook redesign also as an opportunity to rewrite/improve the content of each subject. Making this a time consuming process. The good news is that some minibooks should be coming online soon (say July 2011). We plan to finish at least the Linux Fundamentals (big)book by the end of July (it will consist of six or seven minibooks).