Agile Web Development with Rails

The Pragmatic Programmers are releasing a book soon: Agile Web Development with Rails

"Rails is a full-stack, open-source web framework that enables you to create full-featured, sophisticated web-based applications, but with a twist... A full Rails application probably has less total code than the XML you'd need to configure the same application in other frameworks."

The book is currently available as a Beta Book. After reading only 20% of the book I feel can recommend it. So far it's an easy read and Rails is easy to work with. That means that you can read the book and speak intellegently about Rails in no time, and the more languages you know the better you become at all of them.