See also:
Kalsey Consulting Group - Comment Spam Manifesto
kalsey.com
Weblogger crystallizes the thoughts of many in declaring a cyberwar on those who inappropriately post in guestbooks and weblogs.
Wired - Googlemania: The (Evil) Genius of Comment Spammers
wired.com
Background of the phenomenon of comment spam and how bloggers responded. (March, 2004)
OJR : Bloggers Declare War on Comment Spam, but Can They Win?
ojr.org
"Here's a look at the battle so far." (September 16, 2004)
Six Log: Comment Spam
sixapart.com
Spammers are abusing comment systems to increase their rank on Google. Here are some steps to take to reduce or eliminate this problem.
Learning Movable Type: Concerning Spam
learningmovabletype.com
Types of spam seen on blogs.
Yoz Grahame's Cheerleader: Seven quick tips for a spam-free blog
cheerleader.yoz.com
A list of tips aimed at webloggers to reduce the problem of comment spam. (September 9, 2003)
Big Fractal Tangle: Designing For Lowlifes
bigfractaltangle.com
Discusses how better, smarter tools are needed to block or remove comment spam in realtime. (January 19, 2004)
Internetnews.com - Six Apart Trains Guns on 'Comment Spam'
internetnews.com
The blog tools vendor Six Apart plans to roll out an open online authentication system to fight the growing phenomenon of comment spam. (March 25, 2004)
TypePad AntiSpam
antispam.typepad.com
Provides an open source antispam plug-in for Movable Type and WordPress.
Spam Huntress - Spam cleaning for blogs
spamhuntress.com
Spam huntress dissects blogspam.
Bad Behavior
bad-behavior.ioerror.us
An open source a PHP-based solution for blocking link spam and the robots which deliver it by analyzing the delivery method as well as the software the spammer is using instead of looking at the content of potential spam.
Webmaster Kit: Stop Spam
php.webmaster-kit.com
Offers a script using the Turing Test, intended for spam prevention in guestbooks, blogs and wikis.
Akismet
akismet.com
A plugin which identifies and blocks comment and trackback spam on blogs with integration to various blogging systems.
Jeremy Zawodny's Blog: Using mod_rewrite against comment spam bots
jeremy.zawodny.com
Very short tutorial. (January 8, 2005)- Wired: When the Spam Hits the Blogs
wired.com
Owners of weblogs have recently noticed that their referral logs have become the newest target for spam. (October 26, 2002) 
Blog Spam Database
markcarey.com
Database of URLs and phrases often used by spammers, along with links to related resources and a discussion forum.
BBC News - How spammers are targeting blogs
news.bbc.co.uk
Spammers are turning their attention to weblogs, angering technology analyst Bill Thompson. He calls it "flyblogging." (October 24, 2003)
No Guestbook Spam Anymore
nogbspam.com
Offers instructions for webmasters for avoiding and eliminating spam in guestbook.
MSNBC - Spammers now clogging blogs, IM
msnbc.msn.com
Spam has never been limited to e-mail. But now, commercial pitches are increasingly popping up in online chats, instant messages, cell phones with text messaging and weblog comments. (November 14, 2003)- Jeremy Zawodny's Blog - Guerilla Tactics Against Blog Comment Spammers
jeremy.zawodny.com
Suggestion that bloggers create posts that target the same spammy phrases that blog spammers want Google to find. (October 6, 2003)
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news.google.com
Sacramento Bee
Don't repeat the same comment over and over. We heard you the first time. Do not use the commenting system for advertising. That's spam and it isn't ...
and more »
blog.softtechvc.com
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much time to deal with this crap with nuance and finesse Every now and then I also get the random strange stupid spam like this one coming from an IP address in Canada Tres bizarre Actually since the number of spam messages has grown so much I wonder if the folks at SixApart still maintain all the spam filters that they had put in place in the past or if they removed
bloggersblog.com
unknown
Wed, 12 Apr 2006 22:06:00 GM
ZDNet and CNET have an interesting article about the . comment spam. situation. . Comment spam. continues but it has been lessened somewhat by filtering software. The degree to which the filtering software works really depends on who you talk ...
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