Patrick Lenz wrapped up yet another Rails book: Build Your Own Ruby on Rails Web Applications, published by SitePoint. This one takes a beginners look at the Rails 1.2 framework, building a sample Digg-clone in the process.
Build Your Own Ruby on Rails Web Applications is an easy-to-follow, practical and fun guide to Ruby on Rails for beginners. It covers all you need to get up and running, from installing Ruby, Rails and MySQL to building and deploying a fully featured web application.
Update: Patrick posted a few sample chapters of the book at Sitepoint.