Opt Out of Google
Seeing as spammers post comment spam so as to raise their sites’ Google rankings, a simple if drastic way to prevent it would be to opt out of google. Not a great technique if you blog for popularity, but if you blog for something else – donuts, in my case – we might be onto something. What good are all those random google users anyway? The googs will be IPOing soon enough, and we’ll see which way the free flow of information goes then.