I am using it. My O'Reilly book is not announced yet, but you can join my (non-spammy) mailing list at http://www.solr-start.com/ http://www.solr-start.com/ to

I am using it. My O'Reilly book is not announced yet, but you can join my (non-spammy) mailing list at http://www.solr-start.com/ http://www.solr-start.com/ to be the first to get details (and eventually discounts). Atlas is not bad. Backed by Git, auto-saves, UI editor with a couple of options (Asciidoc, Markdown, etc) and nice on-demand build system. Can do HTML, PDF, and ePub. Certainly a lot better than MSWord way of writing a book that I suffered through for my first (non O'Reilly) book. I am looking forward to when the editing process start, that part was the most painful last time. But I don't think this is open to a general public to be actually used (yet).