Custom 404 Error pages can come in very handy, and also offer a kindness to your site's visitors. We all have those finger-fumbles and it is usually better to show a bad typer an actual page instead of a big old error that makes them feel stupid. Or having them think you are ;)
Simply in Apache add to VirtualHost:ErrorDocument 404 /errordoc-404.shtmlReminder!
If your redirect page is less than 512 bytes it won't work in IE.