One of the best books on Ruby I've read,
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This review is from: Eloquent Ruby (Addison-Wesley Professional Ruby) (Paperback)
I've been coding in ruby on and off for about 9 years, yet I've still learned an enormous amount from this book.
This probably isn't ideal for beginners, but anyone with a little experience with ruby will get a lot from it wether you've been coding for six months or for 10 years.