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bhartzer - 8:02 pm on Jul 29, 2004 (gmt 0)
They're already using the Adsense data in conjunction with the organic SERPs data to find, penalize, and ban sites. Personally, I think it all comes down to manpower.
Personally, I think they're already doing a good job of finding these types of sites. I don't think there's anything else they can do except hire more eyes to manually review sites and act on spam tips from their users.