I'm (almost) certain that this isn't our fault, but we're getting a lot of 500 codes in the Apache logs. Apparently, trac is raising this on virtually every error, including things which should normally just be 404s.
$ curl -I http://www.verdjn.com/wiki/SomethingNotThere
HTTP/1.1 500 Internal Server Error
Date: Wed, 16 Aug 2006 06:23:40 GMT
Server: Apache/2.0.54 (Debian GNU/Linux) DAV/2 SVN/1.1.4 mod_python/3.1.3 Python/2.3.5 mod_ssl/2.0.54 OpenSSL/0.9.7e
Cache-control: must-revalidate
Expires: Fri, 01 Jan 1999 00:00:00 GMT
Content-Length: 4415
Set-Cookie: trac_session=---obscured---; expires=Tue, 14-Nov-2006 06:23:40 GMT; Path=/;
Connection: close
Content-Type: text/html;charset=utf-8
Similar results are seen for /favicon.ico and /robots.txt.