Similar to the way TransFair certifies Fair Trade coffee or USGBC certifies LEED buildings, B Lab is a nonprofit organization based in Pennsylvania that certifies B Corporations. The B stands for "benefit," and refers to corporations that benefit workers, the community and the environment. Recently GOOD created an infographic to help explain what it means to be a B Corporation.
"B Lab certifies B Corporations through the B Impact Assessment, a survey that looks beyond a company's marketing efforts to assess the true impact of a company on its stakeholders, workers, community and environment. To become a B Corporation, businesses must earn an 80 or higher on the B Impact Assessment and amend their bylaws to require consideration of stakeholders' interests." To date, there are over 500 certified B Corporations, representing more than 60 industries ranging from food to law. Some states are even working to grow this community through legislation.
Certified B Corporations include Etsy, Patagonia, and Method, and Sierra Club named B Corporation one of the Most Trustworthy Eco-Cerficiations in 2011. You can read more about B Corporation here, and see the full infographic at GOOD here.