Currently, I'm generating the following pdf with pdflatex: http://dl.dropbox.com/u/2682197/book.pdf
Unfortunately, this document is a bit incompatible with adobe screen reader (for blind people).
This audio recording demonstrates the result of using adobe screen reader with that document: http://dl.dropbox.com/u/2682197/speech.mp3
In the recording, it's impossible to hear the chapter or section headers.
Any ideas of how to build a "more accessible" document?