Like all the styles on that page, this stylesheet works with the default ‘index.php’ template in WordPress, no editing of the template is required (other than the changing the name of the CSS).
I’ve tested this on IE 6, IE 5.5, IE 5, Mozilla, Camino, Firefox and Safari and it looks fine. I also checked it in Opera, but it is a little off there. Apologies to both of you Opera users. 😉