This site demonstrates the Search404 Module and its functionalities
Take a look @ the content generated through devel module, and access the site via a possible 404 URL.
eg: http://demos.zyxware.com/search404/voco
You can view the generated dummy content here http://demos.zyxware.com/search404/node
The Search 404 Administration Page is made available for a logged in user.
User Name: demo
Password: demo
Report Any bugs back to http://drupal.org/project/search404
Thank You
Zyxware