Harrie Verveer explained the concept of Unit Testing very well. The nice thing was that he didn't stop after showing examples, he showed us a proper use case which we would come across on a daily basis. Making it a lot easier for us to really understand it and know how to apply it. Kudos for the live examples!
Great introductory talk on PHPUnit.
Nicely presented and it does a good job of explaining testing concepts and how to apply them in PHPUnit. With nice hands on examples.