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Actually, you don't need to edit your server -at least with Lighttpd-.

PHP automagically (or is this expected behaviour?) gets the string appended to /index.php for you! Check out the example at http://private.woutervdb.com/examples/url-query/index.php/We...!

I've made no changes to my webserver configuration. Works on Lighttpd on my laptop and webserver, not sure if Apache and IIS do this as well.

It's called PATH_INFO and is part of the CGI spec ("The PATH_INFO variable specifies a path to be interpreted by the CGI script"): http://tools.ietf.org/html/rfc3875#section-4.1.5

They also need the following in the .htaccess:

RewriteRule ^index\.php$ - [L]

RewriteRule . /index.php [L]