Akismet is a very smart and effective system for controlling comment spam on blogs, and I know thousands of bloggers swear by it, listing it as their number one plugin for their blogging platform.
Read more on Akismet – the Danger of Collective Intelligence (and why I don’t use it)…
Akismet False Positives & Spam Karma Configuration
Spam Karma for me is the most effective comment and trackback spam management solution because it doesn’t cause me problems with false positives on many blogs where I comment on a regular basis.
As a blogger, it is a huge time saver by sending me email notifications a few times per day if it finds entries that are “possible” good comments and trackbacks, but which tripped up one or more of the various algorithms it uses.
Read more on Akismet False Positives & Spam Karma Configuration…