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Google unveiled more details about its Chrome OS yesterday, and released source code for developers.

Guest: Tom Krazit, CNET News

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Regarding our recent story on the term "unfriend" being named the Oxford American Dictionary's word of the year, we heard from a number of people who say they've never heard anyone say "unfriend," but rather, they hear and use "defriend" instead -- as in, "I defriended her on Facebook because she was always sending me stupid quizzes." Ammon Shea from Oxford University Press was gracious enough to talk to us again to clear up this "unfriend" versus "defriend" issue.

Also today: Part two of our interview with David Michel-Davies regarding the most important Internet events of the decade.

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The folks behind the Webby Awards have published their take on the biggest Internet moments in the years 2000 to 2009.

Guest: Webby Awards Executive Director David-Michel Davies

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Today, Ammon Shea with Oxford University Press on why "unfriend" from the world of social media is the 2009 Word of the Year, and why "netbook," "intexticated," and "sexting" were also considered for the honor.

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Facebook, Twitter and the tools that enable them sometimes get a bad rap. A recent example: a weekend article in the San Francisco Chronicle, which quotes mental health professionals who worry that addiction to our digital tools will lead to a breakdown of interpersonal relationships and a rise in attention deficit disorder.

A new study from the University of Minnesota does not address those issues but does suggest social networks are a good way to get young people engaged current events and civic affairs, and have much potential as teaching tools.

Guest: Christine Greenhow, University of Minnesota

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The Gates Foundation is funding a project to create mobile phone software that will allow people to cough into their phones (PDF) to help determine whether they have pneumonia, influenza or other ailments.

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Google will soon begin rolling out new search technology called Caffeine. It's designed to producer faster, more relevant results.

Guest: Barry Schwartz, Search Engine Land

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Ed Bott joins us today to discuss the many ways to avoid paying full price for Windows 7.

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Today we look back at some of the stories we covered in November, 1999.

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A new study by the Pew Internet and American Life Project finds that the Internet and mobile phones do not lead to social isolation, as some previous research suggested. In fact, there's plenty of evidence that people who spend a lot of time online have fuller social lives.