Using Akismet for spam control has worked out really well over the last few years but I started seeing more and more spam get through (daily) so I decided I needed to look into something that would compliment Akismet. Once I installed the http:BL plugin – I have not had one spam comment get through. About the plugin:
http:BL WordPress Plugin allows you to verify IP addresses of clients connecting to your blog against the Project Honey Pot database. Thanks to http:BL API you can quickly check whether your visitor is an email harvester, a comment spammer or any other malicious creature.
If you are having any problems with spam getting through, check out: http:BL.