At least pennies have more than doubled in value:
A pre 1982 US cent is composed of 95% copper.
Its mass is 3.1 grams, or 0.00683433013 in pounds.
As of today, the price of copper is $3.7852 per pound, putting its value at 2.587 cents, not including the zinc content.
Today's pennies, which are 97.6% zinc cost 1.4 cents to make http://www.fark.com/archives/index.2006-04-30.html
the link is about 1/5th of the way down, but no longer active.
[This message has been edited by PEdoubleNIZZLE (edited 05-30-2006).]