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Interested in learning Ruby, the open-source, object-oriented programming language? Start with Mr. Neighborly's Humble Little Ruby Book, a new e-book that teaches the basics and then some. An introductory excerpt:

In Ruby, everything you manipulate will be an object. Everything. Even the results of operations on said objects are objects; this approach differs from C++ or Java where primitive types exist or some statements do not return a value.

I'm no programmer, but I like the author's relaxed, humorous approach to the subject. (For example, there's a Chapter 0, and it's titled "What'chu talkin' 'bout, Mister?") This looks to be required reading for anyone new to Ruby or even somewhat familiar with it. You can download the e-book as a PDF or view it online, though the author does encourage purchasing a print copy to help support hosting. — Rick Broida
Mr. Neighborly's Humble Little Ruby Book

(Via Lifehacker.)