>Exactly what version of Ruby did I use to write this book? Let's ask Ruby. 
%ruby -v
ruby 1.8.2 (2004-08-24) [powerpc-darwin7.5.0]

Мелочь, а приятно.

Upd. Alex Black, один из главных разработчиков binarycloud, пишет:

...but there's no arguing that ruby kicks the crap out of PHP :) PHP5 is a huge disappointment, to the point that I'm abandoning the language.