There are also many YouTube interviews available. Perhaps this one with Charlie Rose (mostly Grameen 101) or this lecture (perhaps a little more wide-ranging) at Google would be good places to start. NPR takes a look at his most recent book, Creating a World without Poverty and Democracy Now has an interview focusing on the same topic,
As a bonus, here's a recent NYT article on cell phones and poverty and some comment from The New Yorker, "What Microloans Miss."
AMY GOODMAN: Explain your idea of social business.
MUHAMMAD YUNUS: Yes, and I am saying that the conceptual framework of capitalism itself is at fault. That’s what created all the problems. So we have to address that also. And the concept of business, for example, only way the concept of business is defined in a capitalist theory is a business to make money. Profit maximization is the sole mission of business.
And I’m saying this is a misinterpretation of a human being. Human being is not a machine. Human being is not a robot. It’s not a money-making machine. A human being is much bigger than making money. Money-making is an important part of a human being, but certainly it’s not the totality of human being. Human being is much bigger than that. It’s also caring being. It’s a sharing being, wants to make a difference in the world. That part is not included in the business world, in the economic world.