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unreviewed - 10:04 pm on Jul 13, 2006 (gmt 0)
The link below is to the white paper on this at MSN Research. "Automatic and Systematic Discovery of Search Spammers through Non-Content Analysis" "A common approach to detecting spam web pages is through content analysis based on classification heuristics [2,3]. In this report, we propose an orthogonal context-based approach that uses URL-redirection analysis. Our work was primarily motivated by two key observations:" And according to News.com it is now in use.
MSN - Strider Search Defender
[news.com.com...]