[ThePherocity]

Yea, once your model gets more complex than a dozen or so objects, then something like this is awesome. I only with there was an equivalent in ASP.Net MVC which is the current bill payer. (Plant is the closest I've seen, but not quite as elegant, and I'm a little concerned over support).

[edandersen]

How is this different to mocking frameworks like RhinoMocks or the new Microsoft.Fakes?

[ThePherocity]

You're creating an actual instance of that object preloaded with whatever you need rather than a mock of that item which implements a fake implementation. They're not really competing since Mocks are most useful when mocking an interface, and Factory Girl is best at creating a number of usable objects.