Introduction to Economics at UC Berkeley
Trade
http://www.youtube.com/watch?v=z9YprxAWEuQ

There are a variety of sites where you can find exchange rate data. This is one
www.xe.com

You can track exchange rate movements over time.
OECD
www.oecd.org
The mission of the Organisation for Economic Co-operation and Development (OECD) is to promote policies that will improve the economic and social well-being of people around the world.

Lots of extremely useful data at www.data.oecd.org

World Bank
www.worldbank.org

With 189 member countries, staff from more than 170 countries, and offices in over 130 locations, the World Bank Group is a unique global partnership: five institutions working for sustainable solutions that reduce poverty and build shared prosperity in developing countries.   The World Bank data bank is wonderful source of data for economies all over the world.
www.data.worldbank.org

General sites

Adam Smith Institute
Free market think tank.
www.adamsmith.org

American Economics Association
www.aeaweb.org
The American Economic Association (AEA) has 20,000+ members from academe, business, government, and consulting groups within diverse disciplines from multi-cultural backgrounds. All are professionals or graduate-level students dedicated to economics research and teaching.

Bank of England
www.bankofengland.co.uk

The Economist
economist.com
An excellent weekly magazine covering business, economics and finance. You will need a subscription for full access.

Federal Reserve
www.federalreserve.gov
The Federal Reserve System is the central bank of the United States. It performs five general functions to promote the effective operation of the U.S. economy and, more generally, the public interest. You can find information about US monetary policy and inflation here.

Freakonomics
freakonomics.com
Stephen J. Dubner went to Chicago and Steven D. Levitt for The New York Times Magazine’s website full of fascinating insights into how economics works in the real world! Levitt and Dubner wrote Freakonomics, a book about cheating teachers, bizarre baby names, self-dealing Realtors, and crack-selling mama’s boys. It has sold more than 5 million copies in 40 languages. Then they wrote SuperFreakonomics. It too became a worldwide best-seller.

Institute of Economic Affairs
www.iea.org.uk
A free market think tank. Lots of articles on why we need less government, less taxes and more entrepreneurship.

Marginal Revolution
marginalrevolution.com 
A very popular economics blog site by Tyler Cowen is Holbert L. Harris Professor of Economics at George Mason University and Alex Tabarrok who is Bartley J. Madden Chair in Economics at the Mercatus Center and a professor of economics at George Mason University.

New Economics Foundation
www.neweconomics.org
Promoting a view of economics that questions free markets and competition.

OECD
www.oecd.org
The mission of the Organisation for Economic Co-operation and Development (OECD) is to promote policies that will improve the economic and social well-being of people around the world.

Lots of extremely useful data at www.data.oecd.org

Office for Budget Responsibility
The Office for Budget Responsibility (OBR) is a non-departmental public body that the UK government established to provide independent economic forecasts and independent analysis of the public finances.
www.obr.uk

UK Treasury
Budget deficit and debt information
www.gov.uk/government/organisations/hm-treasury

World Bank
www.worldbank.org

With 189 member countries, staff from more than 170 countries, and offices in over 130 locations, the World Bank Group is a unique global partnership: five institutions working for sustainable solutions that reduce poverty and build shared prosperity in developing countries.   The World Bank data bank is a wonderful source of data for economies all over the world.
www.data.worldbank.org

Wall Street Journal
wsj.com
Great US site covering economy and finance. The Wall Street Journal site offers very good coverage of the latest business, finance and economics news and there is a subscription required.