Guesstimation

Guesstimation: Solving the World's Problems on the Back of a Cocktail Napkin

Lawrence Weinstein & John A. Adam,

Here is a book about estimation right in the style of Fermi. Lawrence Weinstein is professor of physics at Old Dominion University. John A. Adam is professor of mathematics at Old Dominion University.

http://press.princeton.edu/titles/8625.html