I have been a huge Spam Karma fan for years but the open source community does not seem to be taking the ball and running with it.
As of January 1st, 2009, I am no longer developing, maintaining or supporting Spam Karma. If you want to contribute to its code or download the latest GPL release, you can check out the code repository, over at Google Code. [Source, unknowngenius.com]
So I’m switching to Akismet. The last time I tried Akismet, I had many false positives. That is, it reported real comments as spam. With Spam Karma, I had almost zero false positives for all the years I used it. If you try to leave a comment and it fails or doesn’t show up, just contact me.