Recently I read article about Unit Tests: http://blog.tabini.ca/2011/09/the-easiest-way-to-add-unit-test-to-your-application/
This is more about how to deal with application that already exists, and works. I totally agree with author, there is no point in sitting for three months only to add them! But adding them while working is much smarter!
I agree that TDD is great, but this is good if You know what You want to build. I used to build prototype to get idea how it can work and after that refactor it, and add features until it is good.
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