A new version is available (links in the first post are updated).
What's new:
- customizable HTML export (via "HtmlExportStyles.xml")
- marginal bugfixes
enitro
You can download the source code from the first post. I'm sorry I kept you waiting...
martz, papagelos
I'm not yet going to implement other export formats. As workaround you can design your own HTML export style and convert the HTML output to whatever you want with
Calibre.