You can opt out of receiving the 'targeted' adverts, but can't opt out of the profiling.
Also, the thing I think is more worrying, you have no access to Google's information profile about you. You can (for a small fee) see you full medical record, and information about you held by companies should in theory be accessible on request. I don't see a way a requesting that Google tell you *everything* they know (and have inferred and associated) about you...
It would be amazingly interesting (and scary!), but won't ever happen as it would give people an instant understanding of the kind of profiling abilities that are routinely happening.
Biting the hand that feeds IT
