A little framework build on top of xUnit which enables a context/specification style of testing with xUnit.net.
Besides an emphasis on a "test case class per fixture" organization scheme for tests and AAA (Arrange, Act and Assert) style of writing tests, this framework also provides Rhino.Mocks integration out of the box.
The framework is based on JP Boodhoos BDD extensions for MBUnit used in his "Nothing but .NET" bootcamps.