It has been nearly four years since Roger Ebert lost his lower jaw and his ability to speak. Now television's most famous movie critic is rarely seen and never heard, but his words have never stopped. ....................................................... Seven years ago, he recovered quickly from the surgery to cut out his cancerous thyroid and was soon back writing reviews for the Chicago Sun-Times and appearing with Richard Roeper on At the Movies. A year later, in 2003, he returned to work after his salivary glands were partially removed, too, although that and a series of aggressive radiation treatments opened the first...