I'm increasingly fascinated by applications which try to aggregate as much human thinking as possible into one narrow focus. Google's Zeitgeist digests a year of searches into a page. Others are faster, more to the moment: Blogdex gathering up leading blog stories, Google News bubbling up the leading stories from thousands of media sources, Daypop grabbing the biggest News and blog posts it can find.
My current favorite is Daypop's Wordburst. This sorts out leading stories, then extracts keywords from them. It's like a poetic language snapshot of the global brain - here's the latest:
basra
clarett
billiton
diana
indicts
mice
ore
negotiable
coffins
mgm
screeners
beluga
eases
assurances
wetlands
explode
hewitt
macgill
doublethink
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