° Metaprogramming “spells”—33 practical recipes and idioms that you can study and apply right now, to write code that is sure to impress. This completely revised new edition covers the new features in ...

A look at what to watch out for in metaprogramming when it comes to speed, and: how ParseTree can be used to implement LISP/Scheme-style Macros in Ruby and avoid some of the issues of Open Classes.

Ruby Cookbook by Lucas Carlson and Leonard Richardson, published by O'Reilly Media, 2006. Chapter 10 of this book contains 16 recipes on reflection and metaprogramming using Ruby.