Virginia Tech has hooked together 1,100 Apple Power Mac G5s together and, as of November 2003, has made the 3rd fastest supercomputer in the world, just behind the supercomputer at Los Alamos (which is only a little faster and over 40 times more expensive) and NEC's Earth Simulator (which is number one) in Japan, which is about 3.5 times faster but is about 60 times more expensive). Go here for more information, or go here to see a video on how they did it.