Excerpt: The world's largest automaker is being driven deep into financial trouble not only by the cars of its competitors, but also by the medical bills of its own workers and retirees. Last year, GM spent $5.3 billion on health care -- enough to buy a GMC Yukon for each of its U.S. employees. By 2008, General Motors will probably spend more on health care in the United States than on its hourly-worker payroll.  MORE >>