The guys at Hop Studios have just released version 1.0 of their Defensio Combo module for EE. We’ve been testing it for awhile here at SEB and I’m happy to say that I like it better than Akismet. It makes use of the Defensio Anti-Spam service which not only learns from spam and flags it for moderation when it suspects a comment fits the bill, but also keeps track of how well it’s doing on your site and provides you with RSS feeds for tracking moderated comments.
It works more or less similarly to Akismet, but it gives a bit more control over how things are handled and a bit more feedback on how it’s doing. The guys at Hop Studios have been very enthusiastic about the development of this module and are looking to add even more features in the future (I’ve recommended an option that ignores comments from registered members). The module is free for use by anyone running EE 1.6.x so if you’re curious to see what it’s like then go download it and give it a whirl.