The Robert Wood Johnson Foundation Web site includes a number of articles and reports regarding the Affordable Care Act. To locate these resources use the search box to search for "affordable care act."
This site contains a wealth of information on health reform.
Law, Explanation and Analysis of the Patient Protection and Affordable Care Act: including Reconciliation Act impact. CCH 2010. This two volume set can be found on the first floor in the stacks at: KF1183.A369 2010.