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The Parallella project will make parallel computing accessible to everyone.

I think their marketing is a bit off on this one. Does everyone actually need parallel computing on this scale? I don't think so. Those who do need it likely already have CUDA running on GPGPUs. Not that I'm implying stifle innovation but the crowd they're marketing to seems to be way off base.

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Yes, everyone needs parallel computing on this scale, it's just that they don't know it (yet). In the same way that everyone needed 3Ghz single core CPU when they already had 2GHz single core CPUs.

GPUs are different to CPUs in many ways, not least of which is that they are very difficult to debug, do not support recursion (this might have changed?), need special,non-standard data structures (streams). Multi-core CPUs suffer none of these limitations and developers can use non-proprietary standard build tools to develop software for them.

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