Some guy had a fun idea : modify his wp-comments.php so this file would write back 47 MB to spambots that try to POST something into it. Waste of bandwidth or ultimate answer ? Apparently he got completely rid of spam in a few days :)
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sounds like a great idea for another spamkarma2 addon. fun, anyone? ;)
I'd like to read more. Are there any references or how to's?
maxpower » oops, I forgot the link. Updated, you'll probably find more details there now.