This is one of the coolest extensions I have seen in a while. "Collusion" by @toolness visually displays active user-sessions for various websites in real-time, and the ad networks with which each are associated (and which are gathering your personal data) . As you actively browse the web, you begin to see that various sites that are interconnected. The more you browse, the more intertwined the links become (hence the name).
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"Sites in red are confirmed trackers by privacychoice.org. Sites in gray are not, but this doesn't necessarily mean they don't collect data on you."
Mouseover any point in the visual matrix, and Collusion will provide you to a link to a profile of that company provided by privacychoice.org, and how aggressively they gather your personal data. Fascinating.
