Click on the graph for a look at the numbers of unemployed from the 1940's through today. This graph could be a great way to get your students thinking about business cycles and the frequency of recessions in the United States. This graph, and many others, can be found at the St. Louis Federal Reserve Bank's excellent website.
If you need a graph related to pretty much any macro related concept the chances are pretty good that the Fed has just what you are looking for. The more you expose your students to charts and graphs the better off they will be come EOCT time.
Here is a list, along with links, of all twelve Fed branches: Boston, New York, Philadelphia, Cleveland, Richmond, Atlanta, Chicago, St. Louis, Minneapolis, Kansas City, Dallas, San Fransisco. For my money the Fed is one of the best places to look for economic data.