Changed examples and narration from Story Runner to Cucumber.
Updated samples and explanations to RSpec version 2.x.
Made bug fixes and compatibility updates to code samples (Ruby 1.8.7, Ruby 1.9.2, and JRuby 1.6.5).
Changed Selenium examples to use a more recently maintained Selenium gem.
Ported sample Rails app (code not shown in the chapter, but app used by the reader) to Rails 3.1.
Updated URLs to tool and documentation pages.