"Google Hot Search topics are turning out to be a useful tool for security researchers at SonicWall who are trying to find URLs for malicious Web sites as well as signatures to help block the malware they contain.

Under a month-old trial project that may become part of the routine malware search, the malicious code research team regularly finds infected sites among the top 100 returned by Google's real-time search engine for those Hot Search topics, says Nick Bilogorskiy, the manager of the team.
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Link to article:
http://www.networkworld.com/news/2010/020110-google-hot-search.html