Turns every 404 Not Found error into a SEO traffic generating event! Help your site visitors find what they were looking for automatically by leveraging both Google and WordPress. It's one of about 6 plugins I use on every WP site I run. Highly recommend you try it for a few months.
«Take My 404 for a Test-Drive
There are a total of 57 HTTP Status Codes recognized by the Apache Web Server. Wouldn't you like to see what all those headers and their output, ErrorDocuments look like?
For the AskApache Google 404 WordPress Plugin update I added a new 404.php that is more advanced than anything previously seen for a 404.php