A campaign to encourage people to drink tap water. The site offers some compelling arguments for consuming tap water rather than buying bottled water, and gives some arousing facts on the cost, health, and environmental benefits of tap water.
PBS' Frontline/World has put together a series of short films on social entrepreneurs about "people who innovate in ways that truly transform our interconnected world." It's stories like these that give meat to Greenblatt's concept of "homemade" solutions.
The co-founders of B Lab participate in Stanford University's series on Entrepreneurial Thought Leaders. Here you can watch a video podcast of them explaining why and how higher standards in corporations can not only improve people's lives but create a healthier corporate structure all.
A 2006 New Yorker article about microfinance as a solution to global poverty, the entrepreneurs who are investing in it (including Nobel Prize winner Muhammad Yunus and Pierre Omidyar, founder of eBay), and the conflict among them over how to do microfinance well and make a profit.