You obviously don't spend enough time on ThinkGeek. . . http://www.thinkgeek.com/computing/usb-gadgets/ae83/

Of course, that having been said, this guy is a raving lunatic and needs his funding pulled ASAP for blatant fear-mongering.

I disagree; pacemakers have been capable of two-way communication for some time with the right equipment. Here's just one example: http://www.medtronic.com/for-healthcare-professionals/products-therapies/cardiac-rhythm/patient-management-carelink/medtronic-carelink-network-for-cardiac-device-patients/index.htm#tab2 And there has been a successful demonstration of a hack: http://www.nytimes.com/2008/03/12/business/12heart-web.html How long until these are automated? Who knows, but just know that they are at risk. . .