OpenBook: Ruby on Rails 2
In der openbook Serie von Galileo das Buch Ruby on Rails 2 im HTML Format.
Archived entries for rails
Rails E-Book
Für eine kurze Zeit gibt es das SitePoint Buch Build Your Own Ruby on Rails Web Applications -nach einer Registrierung - kostenlos als pdf.
This book will lead you through the components that make up the Rails frame work by building a clone of the popular story-sharing web site digg.com. This will give you a chance to get your feet wet building a simple, yet comprehensive web application using Ruby on Rails.