Dr. Joe Rosen at the Dartmouth Medical Centre believes that within five years he’ll be able to graft extra limbs such as wings and tails to humans. According to a Guardian Unlimited article “When we have a limb amputated, our neural map of that limb gradually fades away; and if we gain a body part, our neural map expands accordingly.” Rosen says “If I were to give you wings, you would develop, literally, a winged brain. Our bodies change our brains, and our brains are infinitely mouldable.”
Full Story: The Guardian: I’m having my wings done
Update: It appears that as of Spring 2007 Dr. Rosen is now more focused on facial reconstructive surgery than these more fringe pursuits.