I just found this article on securityfocus which talks about what are the legal implications of computers executing operations on your behalf. Who is responsible if an automated agent buys something on your behalf , or logs on to a website on your behalf by automatically accepting the TOS? As usual technology seems to be moving much faster than the law here. Maybe that is why the book The Sovereign Individual: Mastering the Transition to the Information Age says that technology is gong to end the nation state as government's powers are eroded by technology moving too fast for them to control.