A recent New York Times article - "A Dashboard for Your Body" - led me to nose around the web to learn more about developments in what is often called "self-tracking." It's a fascinating area that is likely to change medical practice, the patient-physician relationship, and even the ways in which we think about ourselves. Home monitoring devices are already letting clinicians - and perhaps more importantly, family members - keep a virtual eye on the frail elderly and homebound people with chronic illnesses. When our dispersed lives keep family members and close friends from keeping a literal eye on a person in need, devices with internet connectivity allow tracking of vital signs, blood sugar, movement in the living space, eating, and more. These capacities would have been useful to me, an only child, and my father, in his 80s and legally blind from macular degeneration, during the years he lived in Florida, a thousand miles away. The telephone, and the front d...