So it seems that if you just need to do a simple task, then a simple solution is, er, simpler..... wow who'd of thought it eh! ;-)
(ie, both an $10 arduino and a $100M super computer can flash an LED, if that's all you want to do. But if you want to say decrypt 1000 parallel streams of 128b SSL encoding in near real time, then the arduino isn't going to perform quite so well)