ihelpyouservices.com - Why you shouldn't publish your Web logs
Forum thread about why you should not publish your website statistics online. Namely, referrer spam. (June, 2003)

kasia in a nutshell: Spamming through referrer logs
A weird referrer entry prompts some detective work and a log sanitization spree. (October 13, 2003)

kuro5hin.org - Referrer log spam
An early article noting website visits from spammers. (May 31, 2001)

MetaFilter - Referer Log Spam
Talks about companies like mastodonte.com and their business models of spamming referrer logs.

Referrer Log Spamming
Brief description of the technique and the purpose, with some examples.

Referrer spam prevention script
Offers a script intended for referrer spam prevention.

Sam Ruby: Referrer Spam
Blog entry discussing ongoing problems and solutions. (November 18, 2003)

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. (October 26, 2002)