MD Bug is a FREE electronic medical record (EMR) solution. So what's the catch? Advertising.
Is it working? Well, I'm not sure that doctors want to trust a free solution. After all, service calls and support issues may get neglected.
However, perhaps someday Google will come up with a professional solution that will interface with Google Health. There is a huge market out there and I have to think that Google is working on developing such an offering.