As part of my recent Readify Developer Network presentation on Agile Development for .NET Developers I did a quick demo on test driven development and unit testing.  I've made a 10-minute video for the TDD section of the presentation and put it on YouTube so you can look at it any time you like.  Enjoy :-)

 

Please note that the slides from the presentation and a higher resolution video will be available from the RDN site shortly.