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Google just announced a major expansion of its Flu Trends program which monitors searches for Flu-related symptoms on Google's search engine to predict Flu outbreaks. Until now, Google only made the data it gathered from searches in the U.S., Mexico, Australia and New Zealand available, but now, Google has expanded the product to cover 16 more countries, including Russia, Norway, Sweden, Germany, France, Poland and Spain.

Last year, Google Knol launched to a lot of hype and skepticism. While, at first, it looked like a possible Wikipedia-challenger, in reality, it didn't attract a lot of users or attention, even though some of the articles on the site are actually quite good and well written. Today, however, Google announced that the Public Library of Science (PLoS), a non-profit organization focused on providing free access to scientific and medical literature, will use Knol to give scientists a place to collaborate and share research on important topics, including influenza research.

It stands to reason that people who are "starting to come down with something" often take the opportunity to search for information on what ails them, even before they discuss their symptoms with a healthcare professional. Who gets more of those searches than anyone? Google, of course.

When Google started looking more closely at anonymous aggregate searches for "flu symptoms" and the like, they discovered that - after cross-referencing that data against information from the Center for Disease Control - they had the ability to predict flu outbreaks by monitoring search patterns. And now, they've published their findings as Google Flu Trends.