When introducing the measurement of national income in the AP Macroeconomics course, there is also an opportunity to discuss the relationship between national income and the standard of living. The implied relationship is a positive correlation. TGreater the national income (particularly when measured as GDP per capita) is linked to better the standard of living (measured by a number of different statistics). Here are a couple of sites you might want to book mark for next year.
The first is from Mark Perry at the Carpe Diem blog. It compares U.S. life expectancy to GDP over time.
The second is world comparison of life expectancy vs. GDP courtesy of Gapminder. (HT to the folks at Chartporn for the pointer.) (By the way, if you haven't played around on the Gapminder site, you really should.) I hope you find these links useful.