The new K Computer housed in the Riken Advanced Institute For Computational Science has allowed Japan to reclaim the top spot on the Top 500 Supercomputer List thanks to its 548,352 central processing cores (68,544 eight core CPUs) capable of 8.16 petaflops. Using 10 megawatts of power and a CPU only design (no GPU acceleration here, folks), it is an extremely powerful and power hungry workhorse! You can read more about the massive machine over at PC Perspective.
