An updated version of the Three Strikes Spam Plugin, now in version 1.1 Beta, is available for download.
Download the new plugin from here. Installation and upgrade are as simple as renaming this file as threestrikes.php, copying it to your wp-content/plugins directory and then enabling it within your admin interface. Please post bugs/suggestions.
[EDIT] The offer to share my personal “Common Spam Words” still stands. I have enough words in there to populate Google. Email me with requests if you want to use that.
[EDIT] If you want my list of spam words, please include a link to your blog with the request so I know that you are not a spammer.
[EDIT] Now with Trackback checking built in. To update, just download the plugin again and re-upload to your blog.