Mr. Neighborly (a.k.a. Jeremy McAnally) has just released his "Humble Little Ruby Book", a Ruby book available in both e-book (PDF) and print formats. The book is a bargain basement $5 as a PDF or $10 in print! Much like Why's Poignant Guide, the Humble Little Ruby Book is written in a conversational style and has a real 'atmosphere' about it. It covers the Ruby language from the very basics through to creating useful and functional programs.