I get referrals from this (daily?) site all the time. Usually the recognizable sites on it have .htaccess enabled. But I noticed today that there are a few sites that have full-size pictures being hotlinked. It's worth it to check and make sure you're not on it.
It's not all porn either ; there are pictures of muslim clerics on the list too. Pretty weird.
http://pail.pu.ru/yesterday.html