I've started a series on test-driven development (TDD) at
Informit.com. The idea is to teach and discuss TDD concepts. The series demonstrates development of a poker (hold 'em) application using TDD from the ground up.
part 1:
http://www.informit.com/articles/article.asp?p=434428 part 2:
http://www.informit.com/articles/article.asp?p=437291 -Jeff-