It's easy enough to make yourself but I suppose you could also make a PHP script to automatically read the webspace ($_SERVER['DOCUMENT_ROOT'] and upwards) then echo out the links.
Here's an example page I knocked up to show the CSS stuff you can do.
http://richard.phpfuture.net:8080/co...t_example.html
It needs Firefox or Mozilla to display properly due to heavy use of CSS 2.