The only content in the browser is:

<title>404 Not Found</title>
<h1>404 Not Found</h1>
[download]

When I use web-sniffer.net I get the following HTTP Response Header:

HTTP Status Code: HTTP/1.1 404 Not Found
Date:    Wed, 17 Jan 2007 23:28:45 GMT    CRLF
Server:    Apache/1.3.37 (Unix) mod_throttle/3.1.2 DAV/1.0.3 mod_fastc
+gi/2.4.2 mod_gzip/1.3.26.1a PHP/4.4.4 mod_ssl/2.8.22 OpenSSL/0.9.7e  
+  CRLF
Connection:    close    CRLF
Transfer-Encoding:    chunked    CRLF
Content-Type:    text/html    CRLF
[download]

So I guess, even though my log is still showing 200, that it is a "valid" 404 error?