What is the Google zeitgeist?

For anyone interested in strategic planning google zeitgeist is pretty impressive...

"Zeitgeist" means "the spirit of the times", and Google reveals this spirit through the aggregation of millions of search queries that are received every day. They have several tools that give insight into global, regional, past and present search trends. These tools are available for you to play with, explore, and learn from. Use them for everything from business research to trivia answers.

http://www.google.com/intl/en/press/zeitgeist/index.html

Take a look….. a comparison of Mortgage Brain searches v Trigold, for instance, shows a 45% : 55% split in 2006, gradually moving to a 51% : 49% split in 2009.