But, the double-entendre can also serve as a reminder that when you choose Google as a webmail provider, you have also chosen a set of people for whom your communication is potentially transparent. Yes, when you choose to drink Coca-Cola you've chosen a set of people who can potentially adulterate your food; that's a fair analogy.
Those reminders alone aren't anything profound, except to emphasize: pay attention to the values and incentives of those you delegate these powers. Google occasionally seems casual or dismissive about privacy concerns, as with Schmidt's recent statement. Until something blows up on them, they actually make more money (and more friends in government) by being lax about privacy protections.
Actually, I'm not nitpicking, I agree with the first guy. If Google were to violate out privacy in such a way, it's quite possible that we would never find out.
Maybe it's time to stop being paranoid and start concentrating or real problems? Like pondering on how to create an e-book reader that doesn't suck or discovering how to cure AIDS and cancer efficiently?
Frankly, for me the abilty to search my emails quickly outweights the risk of some nosey Google employee with a shallow private life reading my private email or bank stuff or whatever.