Recommended Reading [Oct. 25, 2012, 1:40 p.m.]
If Ruby has piqued your interest then I hightly recommend these books to further you knowledge of the language. The first two are recommended, the rest are up to you.
The Well Grounded Rubyist
Programming Ruby 1.9 ( aka the Pickaxe book )
Metaprogramming Ruby
Practical Object Oriented Design in Ruby