SharePoint Test-Driven Development Resources

I have been tasked with figuring out how to integrate test-driven development into my company's new development process. One of the important points is how to do TDD with SharePoint development, which I am not too familiar with. The best I could come up was creating an interface-based service layer around SharePoint. That way, you could have stub or fake classes that implement the interface.
After looking at some mocking frameworks, I realized you could have a manager class that is not interface based and mock the manager when testing. I have a long way to go, but based on the list of articles below, I think I am on the right track. Any suggestions are appreciated.

• Corporate Coder : TDD development with Sharepoint 2007
• Corporate Coder : More thoughts on Test Driven Development with Sharepoint 2007
• Model-View-Presenter Pattern with SharePoint Web Parts - Fear and Loathing
• "Test Driven" SharePoint Development
• OneOfSix - Creating an NUnit base test class for SharePoint applications
• OneOfSix - Creating an NUnit base test class for SharePoint applications: Part 2
• White Paper by Andrew Woodward