It took a couple days longer then I had planned but it’s finally out:
Got all the Akismet features working. While the plugin will work without an API Key, you really should get one. All comments that are tagged as spam by Akismet are placed into an array in the WPDB. You can manage it from the regular Error Page management window. I used the Akismet Comment Spam plugin as a basis for a lot of the UI, so things should be pretty familiar.
[tags]wordpress, plugin, akismet, dunstan-style error page, php[/tags]0