Good story in today's Globe about a thoughtful telemedicine experiment between Partners HealthCare System and EMC Corporation. They will test the proposition that more accurate reporting on blood pressure via electronic means from home will lead to better long-term results than the usual reporting by patients to physicians.
As I understand it, most telemedicine to date has occurred in remote locations, where people have trouble driving to their doctor or a clinic -- or to enable a consult from a specialist to a hospital without that specialty.
But there have also been programs of the sort being tried by PHS and EMC. Here is one from Colorado dated 2003. Here is a more recent one from New York.
This is all part of the "earth flattening" cited below. It will require adjustments by insurance companies to avoid the current perverse incentive of the health care system, in which doctors usually only get paid when a patient physically visits them. If this kind of system results in better results, more convenience, and the advantages of asynchronous communications, the insurance companies that figure out how to reward it will gain a competitive advantage.