Digital health investments are up 73 percent compared to this time last year for companies receiving $2 million dollars or more in venture funding, according to a new report from healthcare accelerator Rock Health. In June 2011, $390 million worth of digital health investments had been reported; that number has climbed to $675 million this year. So far, according to the report, more than 68 companies have raised at least $2 million in funding in 2012, led by Castlight's $100 million deal from May. Ninety-two venture capital firms have invested in digital health so far in 2012. Report