Crossbar Arrays proved in the fab. http://www.bit-tech.net/news/hardware/2013/08/06/crossbar/1
Embedded eight-bit system shows promise. http://www.bit-tech.net/news/hardware/2013/07/31/panasonic-reram/1
Transparent, cheaper, but - crucially - not quite commercially available... http://www.bit-tech.net/news/hardware/2012/09/18/oregon-memristor/1
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