Test driven development workshop

The company I'm currently working for is interested in starting up with Scrum but finding it difficult to make headway. As a start, they've decided to start familiarizing themselves with some of the agile and scrum elements. For example, they asked me to prepare a Test Driven Development (TDD) workshop for them so that they could gain a better understanding of what the benefits are.

Not being an experienced TDDer either, I googled the great StingCalculator Kata by Roy Osherove and prepared this. I found this to be a great kata for TDD because:
1) it allows for incremental building of tests and functionality (triangulation)
2) it quickly demonstrates the value of refactoring and reuse of code
3) you can easily hit red when going for the Obvious Implementation (fast) and so it forces you to go back to Fake It and Traingulation (slow).

I also made a short introduction to TDD and this Kata.