The DocBook source for the book is now in the hands of O’Reilly’s production team. We sent the first batch of copyedits back a few days ago. The rest will be flowing through over the coming two weeks or so.
At this point, we’re mostly reviewing punctuation, typeface, and grammar fixes from our copyeditor, who is doing a remarkably thorough job. We have little ability to act upon any further feedback through the web comment system.
Over the next few days, I’ll update the book web site to hide all comments posted so far, and take the mention of “beta” out of the various paths and URLs (don’t worry, I’ll add forwarding links, so your existing bookmarks won’t break).