My startup Leanpub (http://leanpub.com http://leanpub.com) lets you create and sell EPUB (as well as PDF and MOBI) ebooks. You write in HTML or Markdown, save

My startup Leanpub (http://leanpub.com http://leanpub.com) lets you create and sell EPUB (as well as PDF and MOBI) ebooks. You write in HTML or Markdown, save files in Dropbox and publish with 1 click. Assuming you're writing a technical book, if you use Markdown you can even keep code samples in their own files and include them like you'd insert an image. Ping me at peter@leanpub.com if you have any questions...