title: Preferred unit testing isolation framework for .net
body: <p>I have used the <a href="http://ayende.com/projects/rhino-mocks.aspx" rel="noreferrer">RhinoMocks</a> product for quite some time and have been quite happy with the product - never had a reason to look elsewhere really.  I was recently asked by the good folks at <a href="http://www.typemock.com/" rel="noreferrer">TypeMock</a> to give their product a whirl and was wondering what other developers opinions are about Typemock Isolator.  Are there any other isolation/mocking frameworks that you would suggest and why?</p>