Most of us use Akismet, as it is included with WordPress, but there is a new player in town, and it is called Defensio. Just like Akismet, it is a service where your comments are sent off your site to be analyzed by Defensio before going live on your site.
It is supposed to help block spam, and they report that they are doing a better job than their competition, but who knows if that is true.
I like their management system better than Akismet, but I think otherwise the two pieces of software are rather similar.
There are many great posts about the software, including a kudos from Automattic’s Akismet site. Does Defensio have a chance? I will have to give it a whirl on a few dozen blogs and let you know how it goes. Keep watch for an update on the script sometime in the coming weeks.