No other rankings showed such a drop.
Did medical organizations actually clean up their act? Or did they just manage to whitelist their netblocks at CBL and PSBL?
Either way, it looks like they noticed SpamRankings.net.
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Chris Anderson: The Long Tail: Why the Future of Business Is Selling Less of More
Long Tail > Fat Head; Participation > Broadcast; Niche > Big.
John S. Quarterman: Risk Management Solutions for Sarbanes-Oxley Section 404 IT Compliance
Beyond SOX. Beyond the firewall, into the Internet, where nobody controls everything, and security must become risk management
Jared Diamond: Collapse: How Societies Choose to Fail or Succeed
The author examines societies from the smallest (Tikopia) to the largest (China) and why they have succeeded or failed, where failure has included warfare, poverty, depopulation, and complete extinction. He thought he could do this purely through examining how societies damaged their environments, but discovered he also had to consider climate change, hostile neighbors, trading partners, and reactions of the society to all of those, including re-evaluating how the society's basic suppositions affect survival in changed conditions.
Peter L. Bernstein: Against the Gods: The Remarkable Story of Risk
A highly readable backgrounder on the evolution of risk management, from probabilities to joint stock companies.