I really like the book. I’m a big believer in automating all that I can, that is part of the motivation behind the creation of Rake. Mike provides a lot of great ideas and I can’t wait to try them out. (BTW, Rake gets a footnote mention on page 40, Woo Hoo!).
The book is targeted at the mainstream Java audience, so it talks a lot about ant and Cruise Control. Ruby and non-Java scripting languages are mentioned only in passing, but this is reasonable given the size and scope of the book. Mike says that he wants to encourage non-Java scripting and that the www.pragmaticautomation.com website will feature Ruby whenever he can.
And true to his word, today he posted a stakeout script that runs his unit tests whenever a file changes. Check it out.
Oh, and check out the book too.