see http://windsofchange.net/archives/004141.html
...
For MT: *Solution for comments
spams* "To cut the story short, I wrote a plugin to MT that
will verify if it is a human before it allows comments to be
posted. The idea is pretty simple: Display an image with a Security
Code and demand the user to enter [that] Security Code manually
before allowing posting to go through." See http://www.captcha.net/
for possible updates.
...
*killing_comment_spam_dead*
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