I'm not a fan of comment spam, and I hate splogs even more as they waste time when I'm searching for things so I was amused to see that through a lack of housekeeping Google are actually responsible for a lot of their own problems with cruft in search results.

A recent report details how researchers discovered splogs to be prevalent on Googles own Blogger service!

Luckily tools and techniques are slowly evolving to help fight the problem by tracking the spam back to the sites and advertisers who are benefiting and producing evidence to act against the perpetrators. Microsoft's Strider Search Ranger project has published some guidelines on what to do if you're a webhost or a blogger or just a concerned user to help fight the tide.