I would like a better story around BDD style development.
Take a look Cucumber (cukes.info) for Ruby on Rails. The tool is fun to use and helps me think in terms of the behavior of the application that I'm trying to build.
NBehave also have Visual Studio support, http://visualstudiogallery.msdn.microsoft.com/9ea87b8a-4086-4a02-984c-be4b3663b6cb
Take a look at SpecFlow. Gherkin is implemented in Visual Studio in detail.