first you had to send a snail mail. Then you had the option to mail Team(at)stackexchange... until the ToS changed the address to legal(at). Tim quickly confirm that that is the new address to use... only to have Nick rectify that a day later and point out that the old one is the real one. They mention a form based opt out option, but it is unclear if they will be able to provide it anytime soon (or if it is even being considered). Some say that the opt out mail has only to reference your account, the ToS say you need to disclose your name. And so on.