If all goes well we won't need this software anymore. In a best case scenario the publishers start accepting HTML, and gone are the days of having to convert PDFs to something better...!
It would be great if you could add some basic CSS rules for print? Right now navigation elements are needlessly repeated on each page, obscuring the content.
Also, you forgot to include bold and italics webfonts, so you have faux-styles for all headings and emphasis.