Where have all the cisterns gone?

Am I the only one that has the DoubleClick opt-out cookie, so that less data can be collected about me (or someone using my browser)?

[Here’s the opt-out link, and you can read about it here, or a bit about the company in Wikipedia.]

I comb my cookies regularly, and delete all but essentials. I guess I deceive myself, however, that I’m doing much to defeat the data-collectors.