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.
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.
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.
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