Bernard Lietaer, expert in the field of money and money-systems, wrote a new book called “Rethinking Money” and made a good introduction on tvo:

 

Another Public lecture: Changing our Monetary System. Why and How:

The Potential of complementary Currency

More on Bernard Lietaer:

• Website from Bernard Lietaer: http://www.lietaer.com/
• Wikipedia: http://en.wikipedia.org/wiki/Bernard_Lietaer
• Bio on Transaction.net http://www.transaction.net/money/bio/lietaer.html
• Club of Rome on Lietaer’s work