Stelarc's recent talk at Transmediale has been covered at We Make Money Not Art.
Stelarc is an Australian performance artist who uses medical instruments, prosthetics, robotics, virtual reality systems and the Internet to explore alternate, intimate and involuntary interfaces with the body.
As an aside, I had the great pleasure of meeting Stelarc when he keynoted at TransVision 2004. Unlike the anti-social Steve Mann (who also gave a keynote presentation), he stayed and mingled with the conference attendees for the entire weekend -- he's a very warm and approachable guy. He was even in attendance for my talk on working the conscious canvas, which was a great honour.
I suspect that Stelarc go down as one of the greatest visionary artists of our time.