Akismet
   A plugin which identifies and blocks comment and trackback spam on blogs with integration to various blogging systems.
   http://akismet.com/

BBC News - How spammers are targeting blogs
   Spammers are turning their attention to weblogs, angering technology analyst Bill Thompson. He calls it "flyblogging."
   http://news.bbc.co.uk/1/hi/technology/3210623.stm

Big Fractal Tangle: Designing For Lowlifes
   Discusses how better, smarter tools are needed to block or remove comment spam in realtime.
   http://bigfractaltangle.com/archive/2004/01/19.jsp

Blog Spam Database
   Database of URLs and phrases often used by spammers, along with links to related resources and a discussion forum.
   http://www.markcarey.com/spamdb/

Blogspam.org - Anti-Comment Spam Tactics
   Series of steps to stop spam in your blogs.
   http://www.blogspam.org/solutions.html

Glo Productions
   Essays about comment spam and how one blogger is fighting it.
   http://www.glo-productions.com/category/web-spam/comment-spam/

Internetnews.com - Six Apart Trains Guns on 'Comment Spam'
   The blog tools vendor Six Apart plans to roll out an open online authentication system to fight the growing phenomenon of comment spam.
   http://www.internetnews.com/dev-news/article.php/3331341

Jeremy Zawodny's Blog - Guerilla Tactics Against Blog Comment Spammers
   Suggestion that bloggers create posts that target the same spammy phrases that blog spammers want Google to find.
   http://jeremy.zawodny.com/blog/archives/001000.html

Jeremy Zawodny's Blog: Using mod_rewrite against comment spam bots
   Very short tutorial.
   http://jeremy.zawodny.com/blog/archives/003862.html

Kalsey Consulting Group - Comment Spam Manifesto
   Weblogger crystallizes the thoughts of many in declaring a cyberwar on those who inappropriately post in guestbooks and weblogs.
   http://kalsey.com/2003/11/comment_spam_manifesto/

Learning Movable Type: Concerning Spam
   Types of spam seen on blogs.
   http://www.learningmovabletype.com/archives/000246concerning_spam.php

MSNBC - Spammers now clogging blogs, IM
   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.
   http://www.msnbc.msn.com/Default.aspx?id=3475953&p1=0

MT-Blacklist/Comment Spam Clearinghouse
   A centralized blacklist database of blog spam URLs.
   http://www.jayallen.org/comment_spam/

No Guestbook Spam Anymore
   Offers instructions for webmasters for avoiding and eliminating spam in guestbook.
   http://www.nogbspam.com/

OJR : Bloggers Declare War on Comment Spam, but Can They Win?
   "Here's a look at the battle so far."
   http://ojr.org/ojr/glaser/1095201311.php

Simon Willison's Weblog - Solving Comment Spam
   Feasible ways to stop or thwart comment spam.
   http://simon.incutio.com/archive/2004/01/28/solvingCommentSpam

Simon Willison: Blacklisting Comment Spam
   One man's efforts to create and maintain a blacklist.
   http://simon.incutio.com/archive/2003/09/02/blacklisting

Six Log: Comment Spam
   Spammers are abusing comment systems to increase their rank on Google. Here are some steps to take to reduce or eliminate this problem.
   http://www.sixapart.com/log/2003/10/comment_spam.shtml

Spam Huntress - Spam cleaning for blogs
   Spam huntress dissects blogspam.
   http://spamhuntress.com/2005/04/13/spam-cleaning-for-blogs/

Typepad Vs. Commentspam
   The steps that Typepad has taken in order to rid its users of spam comments.
   http://www.sixapart.com/typepad/news/2004/05/typepad_vs_comm.html

Webmaster Kit: Stop Spam
   Offers a script using the Turing Test, intended for spam prevention in guestbooks, blogs and wikis.
   http://php.webmaster-kit.com/

Wired - Googlemania: The (Evil) Genius of Comment Spammers
   Background of the phenomenon of comment spam and how bloggers responded.
   http://www.wired.com/wired/archive/12.03/google.html?pg=7

Wired: When the Spam Hits the Blogs
   Owners of weblogs have recently noticed that their referral logs have become the newest target for spam.
   http://www.wired.com/news/culture/0,1284,56017,00.html

Yoz Grahame's Cheerleader: Seven quick tips for a spam-free blog
   A list of tips aimed at webloggers to reduce the problem of comment spam.
   http://cheerleader.yoz.com/archives/000849.html