Object oriented languages allow lots of ways to solve the same problem. As you get better at design you see some designs as good [loose coupling, high cohesion]. You can view your design skills as a set of filters you use to choose which design to pick.
Doing TDD leads you to learning some new filters. If a design is not testable it is not a valid design. I want to write an article on this.. but for now check this out: http://www.codeproject.com/useritems/DesignPatternsForUnitTest.asp
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