See also:
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.
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)
Learning Movable Type: Concerning Spam
learningmovabletype.com
Types of spam seen on blogs.
Akismet
akismet.com
A plugin which identifies and blocks comment and trackback spam on blogs with integration to various blogging systems.
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)
Wired - Googlemania: The (Evil) Genius of Comment Spammers
wired.com
Background of the phenomenon of comment spam and how bloggers responded. (March, 2004)
Typepad Vs. Commentspam
sixapart.com
The steps that Typepad has taken in order to rid its users of spam comments.
Webmaster Kit: Stop Spam
php.webmaster-kit.com
Offers a script using the Turing Test, intended for spam prevention in guestbooks, blogs and wikis.
Jeremy Zawodny's Blog: Using mod_rewrite against comment spam bots
jeremy.zawodny.com
Very short tutorial. (January 8, 2005)
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.
Spam Huntress - Spam cleaning for blogs
spamhuntress.com
Spam huntress dissects blogspam.
No Guestbook Spam Anymore
nogbspam.com
Offers instructions for webmasters for avoiding and eliminating spam in guestbook.- 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) - 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) 
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.
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)
Blog Spam Database
markcarey.com
Database of URLs and phrases often used by spammers, along with links to related resources and a discussion forum.- 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. 
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)
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UT The Daily Texan
Be the first to comment on this article! I am not posting spam . I understand posting spam or other comments that are unrelated to this article will cause my ...
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Back in February I listed 10 ways to fight spam on your blog Unfortunately unless you completely shut off comments on your blog there s not really a way to stop spam completely With
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