I have WPFolio running and the php files in the child theme work as expected, but it's still only using the parent style.css. Having read around as much as I can I'm presuming it has something to do with the header.php calling the stylesheet with this line:
<link rel="stylesheet" href="<?php bloginfo('stylesheet_url'); ?>" type="text/css" media="screen" />
And that's where my abilities start to get flakey. This looks to me like it shouldn't pose this particular problem, but no matter what I do, the activated child theme will only reference the parent style.css.