http://dir.xiph.org/index.php/ produces a broken page
http://dir.xiph.org/index.php is also available as http://dir.xiph.org/index.php/ (note the final slash). At that address, css files do not get included properly, since their URLs are relative.
Is there a reason for the page to be available with an ending slash? I was brought there by a link on my Icecast 2.3.1 server version page.