maybe it’s another choice for us, I like the method that say
“This plugin adds a stylesheet to your blog’s html source code. When a browser loads that stylesheet a cookie is dropped. If that user then leaves a comment the cookie is checked. If it doesn’t exist the comment is marked as spam.”
actually I like wp-spamfree it’s very clever, can block 99.99% of spam
and easy to use, nothing to do after activate this plugin
but only one problem that make me crazy is trackback issue
I used wp-spanfree for many months. first time I used and stop to use it because trackback problem and after that I have to flight with spam so I come back to use this plugin again and I see the same problem