David de Florinier and Gojko Adzic have done a great service by providing a free online book about Cucumber, a tool for Behavior Driven Development (BDD) that has become widely used in the Ruby, Java and .NET comunities. It’s available in PDF form, or can be read online. Check it out today!
Note: (2017/08/24) The link has been removed because it’s no longer active. Apparently, it now points to a dating web site of some sort.