If you focus your idea more, I think you might have something. I founded and funded a company that did something along these lines, although I think our portfol

If you focus your idea more, I think you might have something. I founded and funded a company that did something along these lines, although I think our portfolio company was a bit more focused on trying to solve specific problems and generate revenue. Our portfolio company developed watches and mobile (cellphone) software that worked with biofeedback attachments to monitor various aspects of health for users. It all integrated with an online system, which tracked location and company/community trends, among other things. There were games that helped people lower their blood pressure, etc. There were also systems to monitor wakefulness, to predict heart attacks and strokes, etc. I think we had around 80 specific use cases. We were working with an EAP company and several wellness/insurance companies. All of this is past tense, because the company never made it to market. We presented at a single tradeshow and were promptly sued by about a dozen companies. We also got cease-and-desist letters from quite a few major companies (Nokia has several patents in this area, for example.) Just like with location-based apps, there are a slew of overly broad patents that seem to tie up most of the basic functionality you would want in such a device/service. Many startups don't realize the unbelievable amount of 'IP' that has already been sewn up by companies in these areas. The patent holders don't usually go after you until you announce a big funding round or gain some traction in the market. We had to write off most of our investment because we weren't equipped to fight the legal battle at the time. There are a ton of startups that are still working in this area, though...and I think there is a huge market. If someone can figure out a way to circumvent the existing patent mess, I would be interested in investing again. From a hacker point of view, there are some interesting open-source projects. OpenEEG, for example: http://openeeg.sourceforge.net/doc/sw/ http://openeeg.sourceforge.net/doc/sw/