Programming Ruby: The Pragmatic Programmer's Guide
by David Thomas, Andrew Hunt
Publisher: Addison-Wesley 2000
Number of pages: 608
A guide to working with the object-oriented programming language, Ruby, which allows for programming without extra syntax or code. Shows how to easily mine the Ruby language, teaching the basics, plus how to write large programs, how to extend Ruby using C code, and more.
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by Michael Hartl - Addison-Wesley
Leading Rails developer teaches Rails 3 by guiding you through the development of your own complete sample application using the latest techniques in Rails web development. Hartl explains how each new technique solves a real-world problem.
by Huw Collingbourne - No Starch Press
A comprehensive tutorial to the Ruby language. Each chapter is accompanied by ready-to-run source code for all the examples. There is also an Introduction which explains how to use the source code in Ruby In Steel or any other IDE of your choice.
by Dan Nguyen - bastardsbook.com
The Bastards Book of Ruby is an introduction to programming and its practical uses for journalists, researchers, scientists, analysts, and anyone else whose job is to seek out, make sense from, and show the hard-to-find data.
by why the lucky stiff
This is just a small illustrated online-only Ruby book. It won't crush you. It's light as a feather (because I haven't finished it yet--hehe). And there's a reason this book will stay light: because Ruby is simple to learn.