It seems that I'm almost the only one doing that but I've embedded some PHP code in my CSS stylesheet to add intelligence to it.
In order to get it interpreted I renamed the file in stylesheet.css.php and included it with a normal <link> tag within my main HTML page.
The good news: it's working perfectly ...
The bad news: on Apache versions < 1.3.24
Now with 1.3.24, impossible to have it worked. After hours of investigations I started to firmly believe that Apache was the problem. It might not recognise the .css.php as a stylesheet although it is so.
I try to change a bit the configuration (mime and magic) in order to fix that problem but I didn't manage to have it work.
Any help welcomed !