Six months ago and six days after the birth of my son, Subkismet was also born which I introduced as the cure for comment spam. The point of the project was to be a useful class library containing multiple spam fighting classes that could be easily integrated into a blog platform or any website that allows users to comment. One of my goals with the project was to make it safe to enable trackbacks/pingbacks again. I’ve been very happy that others have joined in the Subkismet efforts. Mads Kristensen, well known for BlogEngine.NET, contributed some code. Keyvan...
Jeff Atwood points out several problems with using blacklists (specifically Akismet) to prevent comment spam. He makes the following point: The core problem is relying on a single method of defense against spam. Absolutely. Subtext employs several measures against comment spam, mostly of a heuristic nature. The latest release adds Akismet support as well as Visible and Invisible CAPTCHA. The funny thing about CAPTCHA and especially Invisible CAPTCHA is the number of people who claim it won’t work and is broken. As Jeff points out, this may be true among researchers, but it is not the case in the wild. However...