Having been blessed by the new health reform legislation, accountable care organizations (ACOs) are a hot topic in the health policy world, as evidenced by the just-concluded and well-attended National Accountable Health Care Organization Summit (cosponsored by Health Affairs ) in Washington, D.C. Health Affairs has published much of the research and thinking related to ACOs. For example, in the May 2010 issue of the journal, Mark McClellan,...