I am the co-founder of GoodGuide. You can learn more about the company at GoodGuide.com. Below are some general introductory materials.
Awards and Recognition
New York Times:
A Tool to Aid Careful Shopping
The Trouble with Green Product Ratings
Christian Science Monitor:
People Making a Difference
San Francisco Chronicle:
GoodGuide Rates Products on Ingredients' Safety
GoodGuide App Helps Navigate Green Products
How Green Is It?