Michael 芳貴 Erlewine points out that Omniture’s suggested method for opting out of their data tracking service requires the use of a browser cookie:
That’s right. Cookies are stored in your browser. So if you opt-out in Safari or FF, will you be opted-out in a CS3 app? Um, no. Or in the iTunes MiniStore? No.
In the case of the MiniStore, you can just turn it off. But in the CS3 case (and for any other apps that build such communications in) things are trickier.