Most everyone I know is participating in sensor networks beginning with carrying smartphones. Let us assume, for the moment, this is with their eyes wide open as to the possible extent of such networks' implications. Here's another one, http://www.nauto.com, which I mention as the recording of license plates and everything else in the surround, not just the driver's performance envelope, now comes to consumer gear which, undoubtedly, insurance rates will soon reflect and, in the fullness of time, subpoenas will seek. There are a bejillion other technologies of like import coming and coming soon. Those (of us) who opt-out will face price discrimination and, quite likely, participation discrimination on an accelerating pace; look to Sweden's stance on cash money for an example (banks no longer accept cash deposits, as I understand it). The question here is perhaps obvious: Will you opt out and suffer the consequences thereof? --dan