Here is an article that I came across recently, addressing this very issue (thanks Chelsie!). Click on the link to read the entire article.
A tryst with TOMS
We buy TOMS Shoes or Fair Trade chocolate or poverty-fighting water bottles because we genuinely want to help. But in the frenzy of do-gooder consumption we stop thinking all the way through. We fail to ask how our money will help, and we overlook how our good deeds might actually do harm. We forget that what we want to do for others might not be the same as what they really need.
http://aidwatchers.com/2010/11/a-tryst-with-toms/