Microsoft has been granted a patent on the use of the body as a data bus [aka 'body bus'].
Patent number 6,754,472 describes a method of transmitting power and data to devices worn on the body, and for communication of data between those devices.
In its filing, Microsoft cites the proliferation of wearable electronic devices, such as wristwatches, pagers, PDAs (worn on people's belts) and small displays that can now be worn mounted on headgear.
The patent also ensures that 'it will be apparent that the body may be that of a wide variety of living animals and need not be limited to being a body of a human being.'
The full story can be read here.