Truck and Barter provides a useful list of web-based video resources for introductory economics units here. On top of their list are Video Economics and Brad De long’s Morning Coffee Videocasts.
According to T&B the University of Munich have video lectures including a debate between James Buchanan and Richard Musgrave.
The World Bank and IMF have webcasts; their book presentations and special lectures like the Global Seminar Series are good.
Places like Cato and AEI are good - a sample is Undercover Economist, Moral Consequences of Economic Growth, How Economics Can Help Courts Devise Legal Standards for Dismissing Claims and Summary Judgment, Myths, Lies and Downright Stupidity.