This was pretty good, it's more of a historical account than a lesson in finance. What I got out of it most were his explanations of how debt/credit can arise between individuals and be just as effective, if not more so, than debt issued by central authorities. It makes intuitive sense; credit arising from the participants of an economy better regulates the economy as a whole, than to have that privilege exist solely within a central institution who cannot possibly manage the unique conditions of every single transaction. He also explains how usurious practices can proliferate beyond the control of the public.
There's a freely published audiobook version here: http://www.unwelcomeguests.net/Debt,_The_First_5000_Years
The narrator does a pretty decent job. I recommend listening to it if you want a perspective counter to our current system.