Who's Watching the Watcher?

I was checking the hits on this site to see where folks were coming from and how they got here. I like to check to see if I'm getting hits from referring sites, or if people are just coming straight in. As usual, a good number of the hits were coming from Google image searches on "skyline" or "Chicago skyline", some were coming from Discovery links to blogs, and some were originating from my profiles on Twitter and Plurk. One referrer that caught my eye, however, was "Relevant Noise". Curious, I checked the site and discovered that they offer a service to businesses, apparently scanning blogs for mention of a particular business or topic. Their stated purpose is "dedicated to mining blogs for business intelligence."
Makes you wonder if the next time you rant about some company or product, someone who matters may be listening in and really paying attention. Big Brother, perhaps?