If you are new to economics―or my approach to it―then I suggest you start with the History of Economic Thought lectures, and/or the Managerial Economics lectures, which evaluate conventional economics against the empirical data.
All lectures are in Powerpoint format (which Linux users can now access using OpenOffice.org), and quite a few are supported by simulations run in Vissim―a link for which appears at the end of this page.
These lectures are a combination of two subjects, so there is some overlap (starting with the second set of lectures on Marx)
Lecture 02: Blinder's empirical research into the actual behavior of firms
Lecture 08: Data on US business cycle & Schumpeter's theory of cycles