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I bet Kris his solution was not working for my problem after all ? Who would have thought ? While I should be feeling sad, I am enjoying the irony here ;-)
Now, the question is, on which spam forums was Kris his blog mentioned ? Google to the rescue !
To be honest, the real fix for this is a very loud advertised "the comments on this blog are moderated, no need to advertise irrelevant links". Since the comments are human-fed, that should make some people think twice before doing the effort (I hope). So I guess we urgently need a Drupal module that adds a custom (scare) message right before the comment-entry form.
Any takers ?