In this new post to his blog Volker Dusch gives you a quick guide to setting up Jenkins (formerly Hudson) for your continuous integration environment.

So for me it was time to update [my guide], especially because you now get even more features and nice graphs and some issues have been resolved. If you followed the old tutorial i recommend you create a new job now.. but i'm getting ahead of my self.

He introduces the idea of continuous integration and how it can help your code and development team do an even better job. He chose Jenkins for the example because it's dead simple to setup and get running with the PHP-related plugins needed. He gives you the steps you'll need to get it installed (on Ubuntu) and a sample application that you can run unit tests on to see the results.