The MIT Media Lab has put together sourcemap.org as project to provide visibility into product supply chains. You can search for e.g., "laptop" and see a map (below) of where each part of a typical laptop comes from, total distance the parts travel, estimated CO2 contributions, and how the profit is distributed. It's pretty neat. The project is open source, so you can add stuff if you know about it. The people who read this forum should have a lot to contribute!

There's a nice demonstration video at http://vimeo.com/5133927