Adam Davidson and Alex Blumberg explain the fundamentals:
The first program they did for "This American Life", This Giant Pool of Money --
http://www.thislife.org/Radio_Episode.aspx?episode=355
The second program they did, Another Frightening Show About the Economy --
http://www.thislife.org/Radio_Episode.aspx?episode=365
Their daily blog on the financial crisis of 2008:
http://www.npr.org/blogs/money/
Their explanations are the very best and most clear, accessible, comprehensive, and objective I have ever heard or seen anywhere.