When Spam-Free WordPress died on me this month, I returned to using Akismet. I realise why I moved on. It excludes most spam from Dangerous Thinking, but it lets through enough for checking comments to become a burden. Time to look for something else, or something to supplement Akismet.
Google’s Matt Cutts is quite unequivocal in this presentation about Web Spam. “Search Engine Optimization isn’t spam,” he explains. He’s also clear about what makes a site spammy. It’s definitely worth 10 minutes of your time. You’ll also be able to see why SEO and great content should be one and the same thing.