Sander Marechal has been working with Phing in some of his recent development and has created something useful for compressing Javascript and CSS files on the deployment of your application - a YuiCompressor task.

I am going to write several useful extensions, the first of which is a YuiCompressorFilter. Phing already has support for a JavaScrip minifier in the form of the JsMinTask, but the yui-compressor is more useful. Not only does it usually compress better than JsMin, it can also compress CSS files. Also, because my YuiCompressor extension is implemented as a filter instead of a task you can do fancy things like minifying and concatenating files in a single step.

He includes both a sample of the task and it's configuration (the XML) in the post as well as a link to its source over on github.