Ruby Programming Language is a dynamic, open source programming language with a focus on simplicity and productivity. It has an elegant syntax that is natural to read and easy to write. Ruby was first designed and developed by Yukihiro Matsumoto (a.k.a. Matz), a Japanese computer scientist and software programmer, in the mid-1990s in Japan.
Ruby on Rails (RoR) is an open-source web framework using Ruby programming language. Ruby on Rails released as open source by David Heinemeier Hansson, Danish programmer, in July 2004. Like many web frameworks, Ruby on Rails uses a variant of the Model/View/Controller (MVC) architecture pattern to organize application programming. As of March, 2012, there are more than 200,000 sites using Ruby on Rails per BuiltWith.com
Programming Ruby: The Pragmatic Programmer's Guide
Ruby in Twenty Minutes
Coursera.org: Software Engineering for Software as a Service
Stanford Open Class Room: Web Application
RubyGems.org is the Ruby community's gem hosting service.
RubyForge is a home for open source Ruby projects
The Pragmatic Bookshelf | Learn to Program
Learn Code The Hard Way
Ruby Tutorials for Beginners
RubyMonk - Interactive ruby tutorials to learn Ruby
Rails 3 screencasts
Free episodes from RailsCasts.com