It's hard enough to get <i>to</i> the speed of light, let alone past it. From the Usenet Physics FAQ:
It is a consequence of relativity that the energy of a particle of rest mass m moving with speed v is given by
E = mc^2/sqrt(1 - v^2/c^2) As the speed approaches the speed of light the energy approaches infinity. Hence is should be impossible to accelerate an object with rest mass to the speed of light and particles with zero rest mass must always go at exactly the speed of light otherwise they would have no energy.
http://math.ucr.edu/home/baez/physics/Relativity/SpeedOfLight/FTL.html