Originally Posted by NastyJack

http://invis.free.anonymizer.com/htt.../cohf/4/02.jpg
yeah, the proxy is sort of bypassing the img tag and preventing it from setting the referrer to their site. its like the anonymizer site is actually surfing to your site and then passing it along.
add to your .htaccess file
deny from .anonymizer.com
that should fix it