These are some Ruby and Rails books we recommend:
RailsSpace: Building a Social Networking Website with Ruby on RailsA tutorial introduction to Rails by Aurelius Prochazka and Insoshi founder Michael Hartl
The Rails Way by Obie FernandezA thorough Rails reference, part of the same Addison-Wesley Professional Ruby Series as RailsSpace
Ruby for Rails by David BlackAn introduction to the Ruby programming language designed for Rails programmers
Agile Web Development with Rails by Dave Thomas and David Heinemeier HanssonThe original Rails tutorial and reference