Stefan Koopmanschap has posted about his plugin he's created for the symfony framework that would allow it to handle continuous integration natively - symfonyUndercontrol

From the first moment I was introduced to the concept of continuous integration I have been really interested in this. I've been playing with several packages for CI and set them up for fun. One thing that kept bothering me was that I could not test my own symfony projects with it. I started working on the symfonyUnderControlPlugin a few months ago, and quickly had a working proof of concept. It wasn't perfect, but it did the job.

Strapped for time, he didn't get much chance to work on it until the company he works for (Ibuildings) gave them time to work on Open Source projects. The results is his preview release, version 0.0.1.