Executable Specifications with Gojko Adzic, Jonas Bandi and Aslak Hellesoy

This week Scott learns about Executable Specifications with Gojko Adzic, Jonas Bandi and Aslak Hellesoy. What's all this talk about BDD, Cucumber, Gerkin and SpecFlow? Where's the best place to start and how to Acceptance Tests fit into my existing projects?