RFE: Resources for Economists on the Internet

Essential Principles of Economics: A Hypermedia Text (Roger McCain)

This text, by Roger McCain of Drexel University, covers both micro and macro. It includes questions to test student's understanding. As one would expect, it also includes links to explain concepts. It perhaps takes a somewhat broader approach than many principles texts.

http://william-king.www.drexel.edu/top/prin/txt/EcoToC.html