I updated the book for RC2 the day it came out (announced on Twitter at https://twitter.com/railstutorial/status/344981158825689088; https://twitter.com/railstu

I updated the book for RC2 the day it came out (announced on Twitter at https://twitter.com/railstutorial/status/344981158825689088; https://twitter.com/railstutorial/status/344981158825689088; it just didn't merit a post on the news feed), and I've just updated it for 4.0 final.