|A prototype of the MinION, a personal genome sequencer. Yes, that's a USB plug. Oxford Nanopore Technologies.|
Its error rate is still high (4%) but the company hopes to reduce this error to less than 1% by the time the device launches. In addition, thus far they have only reported the sequencing of viral genomes, which are orders of magnitude smaller than the human genome.
Regardless, this is a very promising start. The technology has been in development for the better part of two decades, but this would be the first practical application of it. With so many known genetic markers of diseases, this kind of device could help usher in a new era of more personalized medicine (as well as a slew of possible ethical issues).