I like this, a professor at University of California at Berkeley started goodguide.com. Basically a guide that rates different products on how environmentally friendly, healthy and socially responsible they are.
Unfortunately as they are based in US there is a lot of products that we have that are not listed, but I think it is still interesting to take a look if you can find your favorite shampoo, bread or dish washing liquid, for example, to see the scores.
What is most important to you? The environment, health or the social factor?