I like your tutorial and guide lines for adding chapters.
Under: Programs to download before you start:
Create separate Windows, Mac, Linux sections.
For Windows: Some other threads have a PDF pre-processor that can shrink the PDF size down and clean-up some odd formatting. There is also a text file pre-processor that makes every paragraph a single long line that could be useful.
Personally I use a programmers editor with macro capability. I can create a quick keystroke macro that puts <P> at the beginning of each paragraph, and </P> at the end, then put the cursor at the beginning of the next paragraph. Check out "EditPlus" or "EditRocket" which has a Windows, Mac and Linux versions: Some of these also have built-in browsers which will show you the results of HTML tags in the text which is very valuable when putting in tags.
http://www.editrocket.com/
Here is a page of free programmers editors. Ones with keystroke macros and HTML preview/syntax highlighting may be of use to people because you are basically making a static .html page when adding tags.
http://www.devzoo.com/index.php?tooltype=WindowsEditor
For
Mac/Linux:
I'm on a powerbook right now, but I have not found any shareware programmers editor that rival the windows version. Python and Perl are available (and Perl is fantastic dealing with text) but you almost have to be a programmer to use it or even run .txt files through sed (a stream editor).