Search engines: query on queries

I have seen occasional references to various reports on what kinds of 
queries are submitted to Altavista and other search engines.  Can anyone 
point me to an authoritative report?

A. Michael Froomkin        | +1 (305) 284-4285; +1 (305) 284-6506 (fax)
Associate Professor of Law | 
U. Miami School of Law     | froomkin@law.miami.edu
P.O. Box 248087            | http://www.law.miami.edu/~froomkin
Coral Gables, FL 33124 USA | It's warm here.