We've created a build script for Phing that will give designers the ability to automatically compress, concatenate, and Prefixize all of their stylesheets and scripts - simply by typing five characters. I'll show you how to use it in this quick tip video.

The post includes a screencast showing you how to get it all set up and working with the rest of your Phing install. They don't help you set up Phing - you'll need that already set up and running to use the task. You can grab teh script directly from github.