See: Book of Trogool, The Humble Index. http://scienceblogs.com/bookoftrogool/2009/08/the_humble_index.php
Excellent (luckily Dorothea’s and my expertises are almost completely orthogonal )
BTW: any half decent librarian who knows her reference collection can answer a lot of fact-type questions faster with the right books with decent indexes than with the major search engine. Yay, indexers!
oops! Broken link – thank you commenter