Slashdot points to the story that a doubly amputated runner was disqualified from participating in the Olympics - because with his replacement limbs he might well be invincible!
I find that a fascinating story - when speaking about cyborgs one often thinks more of the future where computerized high-tech becomes part of (super-?) humans.
So, although I think there is a gradual road to cyborgism, and we are actually already quite some way on it, I find this fascinating, as this is is happening right now, and even with non-computerized stuff!