Nope, the book’s not out yet (though the writing is complete and we’re going through edits now). However, you can find good stuff about TurboGears in print in two places.
I’m tardy reporting on the first one. This is from Japan and I’m not sure if you’d call it a book or a magazine. It doesn’t have ads, but it’s also not as long as a typical book. Whatever you call it, it’s very interesting:
As you can see from the interesting character’s surfboard, this is a “Lightweight Languages” magazine. I wish I could read Japanese, because it looks amazingly interesting, with articles covering 5 different web frameworks that are in use today.
Luckily, I have no trouble reading the second recent appearance of TurboGears in print:
The October 2006 issue of Linux Magazine (at newsstands now) features an article by Mark Ramm which provides another good introduction to TurboGears.
If you’re just getting up to speed about TG or want to read more about it, check these out! Also, be sure to say hi to Mark if you’re at the Ohio LinuxFest this coming weekend. He’ll be at the Spliced Networks booth.