A free tool by Michael Campbell to stop comment and referrer spam by serving up an access denied response to spammer's bots.

Strange things are afoot in blogland. Owners of weblogs have recently noticed that their referral logs have become the newest target for spam.

An early article noting website visits from spammers.

Weblog entry discussing ongoing problems and solutions.

Dave Child provides a blacklist of spamming sites which can be used in an .htaccess file on an Apache server to block referrer spam.

Talks about companies like mastodonte.com and their business models of spamming referrer logs.

A weird referrer entry prompts some detective work and a log sanitization spree.

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

Weblog entry with a few coding suggestions and examples to thwart the spammers.

Forum thread explaining that you should not publish your website statistics online, because of referrer spam.