Aimee Mullins is an actress, model and athlete, has a dozen pairs of designed artificial limbs and 'encourages designers to change the idea of "disability" and the definition of beauty by bringing their talents to both the science and the art of designing prosthetics' TED blog. See her talks at TEDhere and here.
Oscar Pistorius has been mentioned here before, another amazing athlete who uses a 'Cheetah Flex-Foot' by Ossur. Van Phillips is the inventor of the Flex-foot, 'The biggest obstacle, he said, is an amputee’s imagination. Too many do not believe they can walk with ease or run again — until they meet Phillips or someone wearing one of his designs.'
Proto 1, developed for the Defense Advanced Research Projects Agency (DARPA) Revolutionizing Prosthetics Program by APL at John Hopkins University. The prototype is the first fully integrated prosthetic arm that can be controlled naturally, provide sensory feedback and allows for eight degrees of freedom—a level of control far beyond the current state of the art for prosthetic limbs. More at NYT here.
Will the future of prosthetic limbs be more like the Six Million dollar man or will it become more robotic? Hans Alexander Huseklepp seems to think so, his Immaculate concept uses globe joints allowing for greater freedom of movement which would look odd if the arm looked anatomically correct.