[Discover] Google Zeitgeist 2008 http://www.google.com/intl/en/press/zeitgeist2008/index.html
(google zeitgeist trends statistics) 
[Discover] Official Google Blog: How we came up with year-end Zeitgeist data http://googleblog.blogspot.com/2006/12/how-we-came-up-with-year-end-zeitgeist.html (google search keywords zeitgeist)
[Discover] Google Press Center: Zeitgeist http://www.google.com/intl/en/press/zeitgeist/yearend.html (google search statistics zeitgeist)
[Discover] Beloit College Mindset List http://www.beloit.edu/mindset/2012.php (zeitgeist)
[Discover] Zeitgeist 2008 | K-Government http://www.k-government.com/2008/12/10/zeitgeist_2008/ (google zeitgeist tendències cercadors)
[Discover] Twist - see trends in twitter http://twist.flaptor.com/ (twitter statistics tools trends)
[Discover] Guardian: The Folksonomic Zeitgeist http://blogs.guardian.co.uk/global/whatisfz.html (zeitgeist guardian tagging folksonomy)
[Discover] Official Google Blog: How we came up with year-end Zeitgeist data http://googleblog.blogspot.com/2006/12/how-we-came-up-with-year-end-zeitgeist.html (google search keywords zeitgeist)
[Discover] Google Press Center: Zeitgeist http://www.google.com/intl/en/press/zeitgeist/yearend.html (google search statistics zeitgeist)
[Discover] Beloit College Mindset List http://www.beloit.edu/mindset/2012.php (zeitgeist)
[Discover] Zeitgeist 2008 | K-Government http://www.k-government.com/2008/12/10/zeitgeist_2008/ (google zeitgeist tendències cercadors)
[Discover] Twist - see trends in twitter http://twist.flaptor.com/ (twitter statistics tools trends)
[Discover] Guardian: The Folksonomic Zeitgeist http://blogs.guardian.co.uk/global/whatisfz.html (zeitgeist guardian tagging folksonomy)