I was wondering the same thing. Currently, I use this .htaccess to redirect a certain domain:
setenvifnocase Referer "^
http://www.leechingfuck.com" spam_ref=1
<FilesMatch "(.*)">
Order Allow,Deny
Allow from all
Deny from env=spam_ref
</FilesMatch>
This produces a 403, the 403 then sends this to my index.html, rather than a gallery page. My problem however is resources:
Those fucking leeches send me like 150k on a bad day & this bogs down on my server resulting in huge load situations.
Anybody with a better solution?