July provided a large hit of new sites for the referral spammers. They seem to try and come out before this list so I am delaying it a week or so to add the new ones on as fast as they come in.
I use a variety of site logs to find the spam referrers and follow each link to see if any links to any sites exist. For the most part the spam referred sites have no outside links to sites, outside of their google ads, if they have them.
Tektalk goes about making these lists available for systems administrators to add to the .htaccess files for their site. They are ready for cut and paste and will allow your logs to reflect real referrers.