This is an example of how to redirect the browser without sending the referer http header, just like http://anonym.to/ works.
I've tested it on firefox 3.5 so, if you are using another browser, please tell me if it works there.
<html lang="en">
<head>
<?php
if (isset($_GET["url"])){
//if you redirect with meta refresh, the browser doesn't send the referer header
echo '<meta http-equiv="refresh" content="0; URL='.htmlentities($_GET["url"],ENT_QUOTES,'UTF-8').'">';
}
?>
</head>
<body>
<!-- Example: -->
<a href="?url=http://google.com/">Go to google without sending referer information</a>
</body>
</html>