Have you ever thought about what it might be like to implant intelligent devices, not just wear them? Do you think there is a difference? If so, what? We have also developed a taxonomy of implantable device applications that do not just consider the medical space for therapeutics (re: governed by the Therapeutic Goods Administration TGA). Interestingly, in Australia at least, implantables for non-therapeutic applications do not really require stringent regulations but do need to address issues raised by the Trade Practices Act (TPA). So what if developers in the future, or even social networking organisations, or large search engine providers, decide to launch implantable ID products for convenience solutions (like implantables for access control, or implantable for prison inmates that restrict movement in a jail to specific areas). For those of you interested in these socio-ethical questions, you might find the following TEDx talk I delivered on possible future scenarios of interest.
http://www.youtube.com/watch?v=fnghvVR5Evc