I wrote a series of blogs on TDD in Django that covers some TDD with the nose testing framework.
There are a lot of free online resources out there for learning about TDD:
- The c2 wiki article gives good background on general TDD philosophy.
- The onlamp article is a simple introduction.
- Here's a presentation on TDD with game development in pygame that really helped me understand TDD.
For testing web applications, test first or otherwise, I'd recommend twill and selenium as tools to use.
