I've got my browser set to notify me when cookies show up and I've noticed something lately. I'll Google for some business (today it was "berryhill", a local Mexican chain). Then, while the Google results page comes up, I get a request to set a cookie for "berryhilltamales.com" (the correct destination, but still...).

Is this some service that Google is offering to third parties to help them track keyword searches? Any ideas?