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===Writing Friendly Messages===
When an error message is displayed, you can say many things to help a visitor feel reassured they've only encountered a minor glitch, and you're doing the best you can to help them find the information they want. You can say something clever like:

preOops, I screwed up and you discovered my fatal flaw. 
Well, we're not all perfect, but we try.  Can you try this
again or maybe visit our lt;a 
title=Our Site href=http://example.com/index.phpgt;Home 
Pagelt;/agt; to start fresh.  We'll do better next time./pre

You should also attempt to show the user what they want. Check out the [http://www.askapache.com/seo/404-google-wordpress-plugin.html AskApache Google 404 Plugin] to add google search results to your 404.php 

Or, say something shorter and sweeter.  Almost anything you say is better than '''404 Error Page Not Found'''. You can find more information about writing 404 Error pages on the Internet, like  [http://www.alistapart.com/articles/perfect404/ List Apart's Perfect 404].

As an implementation of the Perfect 404 page, this solution will tell the user it's not their fault, if it isn't and email the webmaster, according to WordPress's database.
Helpful 404 page

When a visitor gets a 404 error page, it can be intimidating, and unhelpful. Using Wordpress, you can take the edge off a 404 and make it helpful to users, and yourself, too, by emailing whenever the user clicks a link to a non-existent page.

pre
pYou 
?php
#some variables for the script to use
#if you have some reason to change these, do.  but wordpress can handle it
$adminemail = get_bloginfo('admin_email'); #the administrator email address, according to wordpress
$website = get_bloginfo('url'); #gets your blog's url from wordpress
$websitename = get_bloginfo('name'); #sets the blog's name, according to wordpress

  if (!isset($_SERVER['HTTP_REFERER'])) {
    #politely blames the user for all the problems they caused
        echo tried going to ; #starts assembling an output paragraph
	$casemessage = All is not lost!;
  } elseif (isset($_SERVER['HTTP_REFERER'])) {
    #this will help the user find what they want, and email me of a bad link
	echo clicked a link to; #now the message says You clicked a link to...
        #setup a message to be sent to me
	$failuremess = A user tried to go to $website
        .$_SERVER['REQUEST_URI']. and received a 404 (page not found) error. ;
	$failuremess .= It wasn't their fault, so try fixing it.  
        They came from .$_SERVER['HTTP_REFERER'];
	mail($adminemail, Bad Link To .$_SERVER['REQUEST_URI'],
        $failuremess, From: $websitename noreply@$website); #email you about problem
	$casemessage = An administrator has been emailed 
        about this problem, too.;#set a friendly message
  }
  echo  .$website.$_SERVER['REQUEST_URI']; ? 
and it doesn't exist. ?php echo $casemessage; ?  You can click back 
and try again or search for what you're looking for:
  ?php include(TEMPLATEPATH . /searchform.php); ?
/p
/pre