Akismet recently announced they now have a new competitor in the war against SPAM. Defensio have a similar approach, with a centralized API that gives a thumbs up or down for a comment, and some added information indicating “spamminess.”
In short (and in their own words) Defensio gives you:
You’ll deal with less spam on your blog, period.
Easier Spam Management
Managing your spambox will become dead simple.
Your own habits will help make the filter better over time.
Transparency Through Statistics
Meaningful stats so that you’ll really know what’s going on.
I will be trying their service on my DEV blog, in the meanwhile – Best of luck, guys!