JuQUEEN is the first of four computers on the top 10 list running on IBM's powerful BlueGene/Q platform, with max performance of around 1.6 petaflops. While many computers on the list have been around for the last couple years, the JuQUEEN is brand new. It's actually a replacement for another system, JUGENE, which was the ninth fastest system on the November 2010 TOP500.
Once JuQUEEN is coupled with another BlueGene/Q supercomputer in October 2012, researchers at the Jülich-Aachen Research Alliance will be able to carve out some time with one of the most powerful supercomputers in the world. Researchers have to submit proposals for projects to justify using some of JuQUEEN's cores.