My research on blanking referrer's.  My test configuration was to have page1.php which only had a link on it to page2.php.  On page2.php is where I tried the following methods below to conceal/blank the referrer.

Summary:  There is no magic bullet, but using a combination of methods you can achieve the desired results. When using Opera, Chrome or Safari with Javascript disabled I have not found a way to properly blank the referrer while doing automatic redirection.  If your not into the technical stuff just head over to http://referer.us they've got it figured out and packaged up for free/near free.

Tested Running Windows 7

Browsers Tested
Internet Explorer 8.0.7600
Firefox 3.6.6
Opera 10.60 Build 3445
Google Chrome
Safari 5.33.16.0 – Not related to the study but I noticed Safari is very slow compared to the other browsers

Possible test results: shows referrer (page2.php), blank referrer, doesn't work

Manually click a link <a href="http://neta1o.com/ref.php">Click Me</a>

IE: shows
FF: shows
O: shows
C: shows
S: shows
 
Meta refresh <meta http-equiv="refresh" content=0;url="http://neta1o.com/ref.php">

IE: blank
FF: blank
O: shows
C: shows
S: shows
 
Slow meta refresh <meta http-equiv="refresh" content="5; URL=http://neta1o.com/ref.php">

IE: blank
FF: blank
O: shows
C: shows
S: shows

DMR – Double Meta Refresh
Page 1 – <meta http-equiv="refresh" content=0;url="page2.php">
Page 2 - <meta http-equiv="refresh" content=0;url="http://neta1o.com/ref.php">

IE: blank
FF: blank
O: shows
C: shows
S: shows

PHP Header Replace
header('Location: http://neta1o.com/ref.php');

IE: blank/shows*
FF: blank/shows*
O: blank/shows*
C: blank/shows*
S: blank/shows*

*Warning, only works if direct navigation to redirect page (page2.php) otherwise shows page that linked to redirect page (page1.php).  Basically it takes on the exact referrer of the page referred to it.  So if the page that referred to it is blank it’ll pass blank, if the page referred to it had a referrer it’ll preserve that referrer.

Javascript Location Replace
<head>
<script language="javascript"><!--
location.replace("http://neta1o.com/ref.php")
//-->
</script>
</head> 

IE: blank
FF: shows
O: shows
C: shows
S: shows
 
Javascript Automatic Form Submit
<head>
</head>
<body>
<form name="myform" action="http://neta1o.com/ref.php" method="get"></form>
<script language="javascript"><!--
document.myform.submit()
//-->
</script>

IE: shows
FF: shows
O: shows
C: shows
S: shows

Javascript Automatic Link Click
<body onload="javascript:document.links[0].click();">
<a href="http://neta1o.com/ref.php"></a>

IE: shows
FF: doesn’t work
O: doesn’t work
C: doesn’t work
S: doesn’t work

Javascript Window Location Redirect
<script type="text/javascript"> window.location = "http://neta1o.com/ref.php" </script>

IE: blank
FF: shows
O: shows
C: shows
S: shows

Site in iFrame
<iframe src ="http://neta1o.com/ref.php" width="100%" height=”100% frameborder=0 scrolling=”0” >
  <p>Your browser does not support iframes.</p>
</iframe>

IE: shows
FF: shows
O: shows
C: shows
S: shows

Anonym.to
http://anonym.to/?http://neta1o.com/ref.php

IE: blank
FF: blank
O: shows referrer
C: shows referrer
S: shows referrer

Referer.us
http://referer.us/http://neta1o.com/ref.php

IE: blank
FF: blank
O: blank
C: blank
S: blank

Javascript Parent Location
<iframe src="javascript:parent.location='http://neta1o.com/ref.php'" style="visibility:hidden"></iframe>

IE: blank
FF: shows
O: blank
C: blank
S: blank

iFrame Parent Post
<script>
  function go(){
    window.frames[0].document.body.innerHTML='<form target="_parent" action="http://neta1o.com/ref.php"></form>';
    window.frames[0].document.forms[0].submit()
  }   
</script>
<iframe onload="window.setTimeout('go()', 99)" src="about:blank" style="visibility:hidden"></iframe>

IE: blank
FF: blank
O: blank
C: blank
S: blank