The Brain-Machine Interface, Unplugged 
From: IEEE Spectrum - October 2009
By: Prachi Patel

Clinical experiments have shown that brain-machine interfaces can turn brain
activity into action, but current systems are far from practical. For one
thing, electrodes in the brain must be physically tethered to a computer.
Now, however, researchers are developing prototype wireless interfaces that
could be more practical for daily use. The big challenge is to send data
without the transmitter overheating and killing the surrounding cells.  

Read the entire article at:
http://spectrum.ieee.org/biomedical/devices/the-brainmachine-interface-unplugged

Links:
Reid Harrison
http://www.ece.utah.edu/%7Eharrison/

Arto Nurmikko
http://nurmikko.engin.brown.edu/?q=node/9
http://www.engin.brown.edu/people/Faculty/facultypage.php?id=1106970197

BrainGate - Turning Thought into Action
http://www.braingate2.org/researchTeam.asp