AngryPets.com: ReverseDOS: A free tool by Michael Campbell to stop comment and referrer spam by serving up an access denied response to spammer's bots.
Capn Design Archives: Referrer Spam is Out of Control: Blog entry with a few coding suggestions and examples to thwart the spammers.
ihelpyou.com: Why You Shouldn't Publish Your Web Logs: Forum thread explaining that you should not publish your website statistics online, because of referrer spam.
ILoveJackDaniels.com: Block Referrer Spam: Dave Child provides a blacklist of spamming sites which can be used in an .htaccess file on an Apache server to block referrer spam.
Kasia in a Nutshell: Spamming through Referrer Logs: A weird referrer entry prompts some detective work and a log sanitization spree.
kuro5hin.org - Referrer log spam: An early article noting website visits from spammers.
MetaFilter - Referer Log Spam: Talks about companies like mastodonte.com and their business models of spamming referrer logs.
Redemption in a Blog: Smarter Referrer Spam?: Blatant referrer spam may be evolving into more a subtle game.
Referrer Log Spamming: Brief description of the technique and the purpose, with some examples.
Sam Ruby: Referrer Spam: Blog entry discussing ongoing problems and solutions.
Wired: When the Spam Hits the Blogs: Strange things are afoot in blogland. Owners of weblogs have recently noticed that their referral logs have become the newest target for spam.