Not sure if you are aware of this link
http://www.htaccesstools.com/hotlink-protection/ ...about htaccess for anti-hotlinking ? I know sometimes when I review submitted sites with htaccess for preventing hotlinking, they forget about the people who use anti virus and personal firewalls which often breaks all images and graphics on a website that uses this method to prevent hotlinking. The problem is blank referrers...so in my submission rules if anyone does this, I gave them that link to solve the broken site images...