A Practical Introduction to Ruby: First Steps
   Beginners introduction, on installing Ruby, and writing a first simple script.
   http://coolnamehere.com/geekery/ruby/rubytut/part01.html

Learning Ruby
   By Daniel Carrera. Introduces programming, Ruby, assumes familiarity with computers in Unix X Terminal environment, but not Ruby; simple descriptions, many screenshots. Unfinished, but well done and useful for what is done.
   http://www.math.umd.edu/~dcarrera/ruby/0.3/

Ruby Embedded into C++
   Describes how to embed Ruby interpreter in C++, gives skeleton to build on, treats concepts of embedding, advanced topics like SWIG. Descriptions, code, diagrams, links, news.
   http://metaeditor.sourceforge.net/embed/

Ruby FAQ
   Questions and official answers on Ruby.
   http://www.rubycentral.com/faq/

Ruby User's Guide
   Original Japanese version by matz. First English translation by GOTO Kentaro and Julian Fondren. Further translation and editing by Mark Slagell.
   http://www.rubyist.net/~slagell/ruby/

Ruby-Doc.org
   Ruby documentation project: links and downloads of programming information, on many aspects of Ruby.
   http://www.ruby-doc.org/

RubyCocoa Resources
   Documentation and examples, as digital books, for RubyCocoa, a bridge between Ruby and Objective-C, a way to make desktop programs with Ruby.
   http://www.rubycocoa.com/

Things That Newcomers to Ruby Should Know
   List of most common problems in Ruby, in HTML, text. Table of contents, descriptions, code samples, links. By Bill Tjokroaminata.
   http://books.rubyveil.com/books/ThingsNewcomersShouldKnow/

Thirty-seven Reasons I Love Ruby
   By Hal Fulton.
   http://rubyhacker.com/ruby37.html

Try Ruby
   Beginner's basic tutorial, online, interactive, works in Web browser, has Ruby interpreter above with lessons below.
   http://tryruby.hobix.com/