This is a printing of the PDF version [1] of Why's Poignant Guide to Ruby. I'm not making any profit off of this, it's exactly Lulu's printing cost.
As for the description of the book itself, I'll leave that to _why:
This is just a small Ruby book. It wonÕt crush you. ItÕs light as a feather (because I havenÕt finished it yetÑhehe). And thereÕs a reason this book will stay light: because Ruby is simple to learn.
[1]http://www.ember.co.nz/files/resources/whys-poignant-guide-to-ruby.pdf (or you could just download the digital version of this book).