I recently made a service named Docverter[1] that attacks this from the other end, where you write your book in Markdown or various other markup formats and pro

I recently made a service named Docverter[1] that attacks this from the other end, where you write your book in Markdown or various other markup formats and produce ebook files via pandoc and calibre. It's way more do-it-yourself, but it could be a useful backend for this or other services. [1]: http://www.docverter.com http://www.docverter.com