I add some scientific references for Google Insights for Search:

* Google Predicting the Present
http://www.google.com/googleblogs/pdfs/google_predicting_the_present.pdf

* Google Econometrics and Unemployment Forecasting
http://ftp.iza.org/dp4201.pdf

* Query Indices and a 2008 Downturn: Israeli Data
http://www.bankisrael.gov.il/deptdata/mehkar/papers/dp0906e.pdf

If it is considered a useful tool, and I think it is, it is important to
reflect on keywords to use. Second, is interesting to see these trends in
comparison with other indicators such as number of users/posts in mailing
list, Google Scholar Citations, etc...

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