Granted, you have to use Firefox for this plugin, but after a morning of doing my daily work routine I found this rather astonishing and revealing about the depth of the tracking being done on the web today…
Using interactive visualizations, Lightbeam enables you to see the first and third party sites you interact with on the Web. As you browse, Lightbeam reveals the full depth of the Web today, including parts that are not transparent to the average user. Using two distinct interactive graphic representations — Graph and List — Lightbeam enables you to examine individual third parties over time and space, identify where they connect to your online activity and provides ways for you to engage with this unique view of the Web.