Well, it's published.
It looked like the additional material for the astronomy, http and mail chapters was threatening to make the book too big even for glue binding, so I've split the book. My hope now is to have the book "YAAF: The Other Libraries" published in another month or so when I finish it; that second book will probably run a hundred and fifty pages or so. (The first runs 400 pages total.)
There is a third book in here somewhere in my brain called "Design Patterns with YAAF" which would discuss more the sorts of patterns that I assume for software development. This would include many more examples, and would be more or less a sort of "so you want to do X; here's how" book than a "here's the classes and a rough idea how to use them" sort of book.