Supercomputers at home will be common soon. Intel is going the road of multi-core, I'm typing this on a machine with two 4 core CPUs. Soon we'll have not just 8 but 16 and then 64, etc, cores in a sub $2K machine you can buy from Dell or HP or who ever.
Well, for a few grand, you can get a TeraOPS development board with a 336 core chip from Ambric. The chip at the heart of it is only a couple hundred (quantity 1000).