My latest DF draft is in playtest at the moment. It's only open to SJG freelancers, but I've already had a few pairs of eyes going over the content.
It's in a preliminary layout format, too, so it's a bit past the usual "check this first draft ms" stage.
A lot of little issues have been picked up, of course - things that seem obvious once you see it in a new format or with another's eyes.
So my book is getting that much closer to publishing!