I have just learned about and started to use two new tools on my other blog to combat comment spam. Akismet was doing well but I was moderating more than I should. One plug-in is Bad Behaviour and this interrogates incoming traffic and blocks anything that is attempting the nefarious. This cuts off spam bots before they can even see the blog. Spam Karma 2 is the other new weapon in my arsenal. It is another spam detector and using it alongside Akismet is following the defence in depth approach: when spam gets past one, it is unlikely to pass the other. Both can coexist together and there apparently is an Akismet plug-in for Spam Karma that does away with the need for Akismet itself. The array of options offered by Spam Karma may put off some but that means that extra power is there should it ever be needed.