I worked for years for a internet-healthcare startup building a webapp for physician practices, with lots of attention to billing. After a successful IPO, a co

I worked for years for a internet-healthcare startup building a webapp for physician practices, with lots of attention to billing. After a successful IPO, a couple of us have branched out to a new company (http://www.mariahealth.com http://www.mariahealth.com) trying to improve the user experience of healthcare. Regulations need to be considered, but a bigger challenge is that many powerful players (e.g. hospitals, health insurance cos.) who you often need to work with and can be risk-averse or capricious with respect to technology and startups. But that situation has improved hugely over the course of the last year or two. As a result it seems like a good time for startups. Especially in the U.S., but not only there (differences between different countries health systems are often exaggerated). I doubt there's an industry where it's easier to find problems.