I'm happy to announce we've just released a web-based format converter,
Simplicissimus BookMaker:
http://bookmaker.simplicissimus.it
Simply upload your .odt or .doc. or .rtf or .txt (utf -8 required in the last case), clic the convert button and have it done in a matter of seconds (or minutes, depending on the file, of course) converted in PDF format optimized at your choice for the iLiad or the 6inch display-based readers (Cybook, Bebook i.e. Hanlin V3, Sony Reader).
More details in
Q&A section.
Feel free to give us your feedback for bugs & developments.