Ellis Jones writes a useful little book, The Better World Shopping Guide: Every Dollar Makes a Difference, 4th edition, 2012. This shows, for many shopping categories, which companies are environmentally responsible and respect workers' rights.
Voting with our pocketbooks in such ways has long been a goal; this book (and website) ferrets out information to make it more possible. The 4th edition paperback and Kindle data are as of July, 2012. The website data is dated 2006.
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Madison's Worker's Rights Center and Interfaith Coalition for Worker Justice have published a Just Dining Guide for downtown Madison: rating restaurants on worker pay and rights.
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There's a living wage calculator at http://livingwage.mit.edu/