The Ruby Way: Solutions and Techniques in Ruby Programming, Second Edition
by Hal Fulton
Publisher: Addison Wesley Professional
Pub Date: October 25, 2006
Print ISBN-10: 0-672-32884-4
Print ISBN-13: 978-0-672-32884-8
Pages: 888
http://techbus.safaribooksonline.com/0768667208

Jeff Atwood has really nice post.

http://www.codinghorror.com/blog/archives/001025.html

I looked at Ruby couple times before and really liked how the syntax feels. Since version 2 of Ruby on Ralis came out and I bought a book few month ago I should really concentrate and try to learn it. With IronRuby on .NET framework and DLR I feel that I own myself to learn the original language  and framework first and only then copmare it to IronRuby implemention.