Test for comment spam, and automatically mark bogus comments as spam.
I've seen Steve write about this on his blog a few times before I decided to try it out, and I'm glad I did.
The plugin has few options, and those that exist could do with more human-friendly explanations, rather than technical detail, but the plugin works.
In the past days I've only had to retrain a handful of comments, the plugin seems to be doing an excellent job.
Installing the plugin was just a matter of uploading it to
wp-content/plugins, and once activated it just worked.
There aren't any useful options I could see, the behaviour is just "on" or "off".
That said when it was enabled the spam comments were almost totally stopped. In the first day it dropped 400+ comments and let through around 20 legitimate ones.
No obvious mistakes yet, but it looks like you can train the good/bad comments it made a mistake on.
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