It’s worth reading:
- http://gojko.net/2009/02/27/thought-provoking-tdd-exercise-at-the-software-craftsmanship-conference/
- http://gojko.net/2009/08/02/tdd-as-if-you-meant-it-revisited/
- http://www.katacasts.com/
Code retreat looks pretty similar to our TDD courses: http://www.coderetreat.com/how-it-works.html