Jul 31, 2010
I have used "Rhino" and "Moq" and both seems to be quite good enough for most situations. But due to the fluentness of the API's I tend to move towards "Moq" more frequently now.
TypeMock is great but has a price tag as highlighted.
Aug 08, 2010
At my company I'm pushing for MOQ as the standard for .NET Mocking frameworks along with custom mocks.
I've used Rhino.
Typemock is expensive but it is the one to use for legacy older apps that do not utilize interfaces in the application design.
Up need to understand and use dependency injection and IoC techniques with the majority of open source mock frameworks.