I read some early drafts of this book and really liked it: the only downside was that it continues to use analogies to physical objects (bikes, gears) which isn’t a great way to really grok OO. Though it is a classical way to explain it.
What’s the discussion value in linking to an Amazon page? This is just a product announcement.
The book has been pretty highly anticipated in the Ruby community, and just came out. I, for one, didn’t remember the release date, and so knowing it was released got it a +1 from me.