The entire October 2002 issue of Linux Productivity Magazine is devoted to LyX, a book authoring and typesetting product that also happens to be GPL licensed and runs on Linux.
This issue of Linux Productivity Magazine details everything needed to write a professionally typeset book in LyX. Included are installation, configuration, distinctions between LyX and LaTeX, creating your own styles (both environments and a method of color based character styles), documentation resources, learning by reverse engineering, fancy headers, and modifying existing LaTeX commands and environments without modifying the original file.
