Hi to all
I'm new here so please be patient with my bad english and my lack of knowledge about past sentences.
For converting pdf in a cybook format I suggest to use the new OpenOffice (3.0 beta) with the PDF extension. It can open pdf and convert them into odf file.
Next you can try
http://bookmaker.simplicissimus.it/ that convert a .doc or, better, .odf into a well formatted pdf document for CyBook.
Give it a try.