Google revamped the mathematical formulas it uses in its search rankings last week, part of an ongoing effort to weed out sites that game the system, as it seeks to preserve the quality of its search results.
"Overall Google has done a great job and there are very few cracks in the system," said Conductor Inc. CEO Seth Besmertnik. "But spammers are getting smarter and Google needs to keep getting smarter."
A video from the Wall Street Journal provides more info...
Not sure if this is good for marketers
Not sure if this is good for marketers. Many sites disappeared from the result pages.