It's a good article overall, but fails to mention Sigil (<a href="http://code.google.com/p/sigil/" rel="nofollow">http://code.google.com/p/sigil/</a>) as an alternative to Adobe's InDesign and Thinkubator (disclaimer: I am a contributor to the Sigil project).<p>Sigil is a free and open source WYSIWYG epub editor which runs on Mac, Windows, and Linux.