Money

American Currency Exhibit: from Federal Reserve Bank of San Francisco
Ancient Currency: a guide to money in ancient times, from CompareCards
Colonial and Continental Currency: a new nation’s currency, from Federal Reserve Bank of San Francisco
Currency & Coin: from Federal Reserve Bank of Richmond
Currency and the US Presidents: from ProCon.org
Currency Notes
: an overview of U.S. Paper Currency, from Bureau of Engraving and Printing

Money: for 8th Grade History
Money Around the World: from Payoff Pilot
Money Factory: from National Geographic
Money Teaching Unit: by the Minnesota Literacy Council

Money Museum: from Federal Reserve Bank of Richmond
Symbols on American Money: from Federal Reserve Bank of Philadelphia
The History of Money: from PBS
U.S. Currency: from the United States Treasury Bureau of Engraving and Printing
What is a Dollar Worth? uses CPI 1913-2004, from Federal Reserve Bank of Minneapolis
World Currency Gallery: view currencies from other countries, from Banknotes.com 
World of Money: from British Museum