One of the nice things about CakePHP is that it includes ready to use CSS compression. Granted, compressed CSS can be buggy at times, but for the most part it works just fine.
It also includes functionality to cache the resulting files. What more can you ask for?
The only slight caveat is that PHP 5.0 is required for the JSMin library, but who still runs PHP 4 anyway?
Mr. Mark, we thank you.