A good free Ruby book/tutorial

For the last couple of years, Ruby has been my favorite programming language (I still often use Common Lisp for performance reasons and Java when it is requested). I just saw a link to a neat little free PDF web book on Ruby that looks good for recommending to people who want to learn the basics of Ruby in an hour or two. The guy who wrote this has also written a plugin to VisualStudio 2005 for Ruby development.

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