Sourcemap shows supply-chain maps that reveal all the places in the world that feed into the common goods we consume in our lives. The service's about page implies that the supply-chain data comes from companies themselves, but there's a lot of what seem to be user-generated maps like this complex map labelled "Laptop Computer". It's a tantalizing set of maps, but I wish there was more information on the data-sources that went into each map.
On the other hand, I'm loving this reconstruction of Western Electric's 1927 telephone manufacturing supply chain by Matthew Hockenberry, who added this information: "This is a reconstruction of the supply chain for the Western Electric produced 'candlestick' style telephones of the late 1920s. Information is largely drawn from archival Western Electric/AT&T materials, as well as those of supplier companies. Some imagery is currently included for cotton and copper sources. This is a rough draft - many details are missing or incomplete."