All comments into my blog are moderated and must be approved.  The blog engine that I use does that rather handily for me.

The spam scoring by our server has been doing a good job of keeping those attempts out of the comment approval queue.  So I don't see most of the spam. It’s detecting about 97% of the spam so I haven’t felt the need to resort to another method of prevention.

But it might be good to further delineate what spam is (borrowed from Raymond Chen):

  • Email spam is about tricking humans into reading your message.
  • Comment spam is about tricking search engines into giving the linked-to pages a higher ranking.
  • Trackback spam also about stealing somebody else's content and republishing it to drive traffic to your own site. I'm not aware of any spam that takes my own email and sends it back to me.

And as Ray recently said, "Even I as a human being have trouble telling the difference between spam and ham trackbacks."

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So I for one really appreciate good software that, to some degree, does this drugework for me.