http://images.amazon.com/images/P/0974514055.01._AA240_SCLZZZZZZZ_.jpg

''Programming Ruby: A Pragmatic Programmers Guide'' by AndrewHunt, ChadFowler, and DavidThomas (ISBN: 0974514055)

Also known as the PickAxeBook because of the pickaxe on the cover.

The first edition of the book (for RubyLanguage 1.6) is available online as OpenContent at http://www.rubycentral.com/book/. Also with frames navigation at http://www.ruby-doc.org/docs/ProgrammingRuby/ and http://phrogz.net/programmingruby/.

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Interestingly, if you check the Amazon page for the first edition (ISBN 0-201-71089-7), you will find (in addition to 3 reviews -- all five star, and KentBeck's glowing back cover review) that buyers of the book also bought:
* ExtremeProgrammingInstalled (The XpSeries) by RonJeffries, et al.
* PlanningExtremeProgramming (The XpSeries) by KentBeck, et al.	
* Designing Object-Oriented C++ Applications Using Uml by RobertCecilMartin 
* WritingEffectiveUseCases (The Crystal Collection for Software Professionals [CrystalClearMethodology]) by AlistairCockburn 
Something about great minds...?? -- JimRussell

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See also ThePragmaticProgrammer
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CategoryRuby CategoryBook CategoryOnlineBook