Roadrunner: 1.026 quadrillion calculations per second.
The new Roadrunner supercomputer is more than twice as fast as BlueGene/L, making it the first petaflop capable computer. It uses Red Hat Linux and has “almost 7,000 AMD Opteron dual core processors and almost 13,000 IBM PowerXCell 8i CPUs in special designed TriBlades connected by Infiniband.” You can read the complete system overview here [pdf].
To put the performance of the machine in perspective, Thomas P. D’Agostino, the administrator of the National Nuclear Security Administration, said that if all six billion people on earth used hand calculators and performed calculations 24 hours a day and seven days a week, it would take them 46 years to do what the Roadrunner can in one day.
IBM 
is doing a lot of very cool stuff. Anytime anyone asks me for a safe stock to invest in, I recommend IBM. They are also working on the Blue Brain project.
IBM is helping to drive us to the Singularity, and I think they will make a lot of money along the way.
