Last March, the husband-wife team launched The Walters Physician Incubator, an Austin, Texas, nonprofit that's open only to physicians with a startup idea. In less than a year, the incubator has grown from five to 56 physicians, ranging from newly minted doctors to seasoned physicians in their late 60s. Their ideas range from innovative medical devices to interactive websites. "Doctors come to this incubator typically because they have been batting around an idea that could help their patients or change the way medicine is currently being practiced," said Haas. "Very few consider leaving medicine."