On the Ibuildings techPortal site, they've posted the latest episode of their "DPC Radio" series (as recorded at the 2011 Dutch PHP Conference) - Rowan Merewood's session "TDD and Getting Paid".

Test-driven development is generally regarded as a good move: it should result in simple decoupled design, your tests tend to cover behaviour not methods, and far fewer bugs. However, just getting unit tests in on a real, commercial project is hard - switching to TDD is even harder. [...] So, instead of beating ourselves up about not being perfect let's look at an interactive approach to adopting TDD principles. We'll look at tactics for selling TDD to your client, boss and colleagues. This talk will also cover methods for making TDD easier for you by showing you what tools you can use to integrate it into your development environment.

You can listen to this new session recording through the in-page player, by downloading the mp3 or by subscribing to their feed.