Eli Lopian, Typemock CEO and awesome Coder, just created a nice little API wrapper around Typemock Isolator that would allow a very simple and readable "Swapping" effect between classes. It would allow you to write code like this:
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Read the complete post at http://weblogs.asp.net/rosherove/archive/2008/05/17/quot-swapping-quot-instead-of-quot-injecting-quot-calls-between-classes.aspx