The url should be changed to:<p><a href="http://chimera.labs.oreilly.com/about" rel="nofollow">http://chimera.labs.oreilly.com/about</a>
I am using it. My O'Reilly book is not announced yet, but you can join my (non-spammy) mailing list at <a href="http://www.solr-start.com/" rel="nofollow">http://www.solr-start.com/</a> to be the first to get details (and eventually discounts).<p>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.<p>Certainly a lot better than MSWord way of writing a book that I suffered through for my first (non O'Reilly) book.<p>I am looking forward to when the editing process start, that part was the most painful last time.<p>But I don't think this is open to a general public to be actually used (yet).
We use Atlas to build the e-book versions of Pro Git (which you can download at <a href="https://progit.org/" rel="nofollow">https://progit.org/</a>). We don't use their editing system, though; it's basically a continuous-deployment system for the book, and it does a pretty great job at that.
Looks like a proprietary version of: <a href="https://github.com/softcover/softcover" rel="nofollow">https://github.com/softcover/softcover</a>