Dave Thomas is busy writing the first Rails book and has been making great progress lately. In his blog post Quite a Week For Rails, he says:

I’ve actually finished enough of my new Rails book that I’ve released some chapters to a wonderful panel of reviewers (no more needed right now, thanks). I’m starting to get happy about the way this book is turning out—I’m looking forward to a late-summer release.

The book is naturally to be published by The Pragmatic Bookshelf and distributed by O’Reilly.