Evan Solomon

When you click links, your browser sends referrer information to the site you land on. This is how you get things like referrer counts in Google Analytics. Sometimes, though, you don’t want people to know where you clicked their links from. By default, this plugin will hide your referrers for links from <code>wp-admin</code>. You can also use it to hide links on the front end of your site by making a plugin along the lines of this.
<pre><code>add_action( 'wp_enqueue_scripts', 'es_anonymous_admin_links' ); </code></pre>

Anonymous Admin Links

Hide the referrer for external links in wp-admin using href.li

dkukral

Joe Boydston

Droyal

Plugin for WordPress allows admins to unload / load S2 based on different criteria (inbound referrer, zip code, city, etc) 
Requires s2member plugin 
Requires PHP GeoIP module
Tested and working with S2Member Control V120703 + S2Member Pro v120703

S2Member Control

Plugin for WordPress to control when the S2 Member plugin is loaded / unloaded

Anonymous Admin Links vs S2Member Control