Click here for FindLaw's antitrust resources.
The FTC maintains a helpful web page on health care antitrust issues.
The Federal Trade Commission held an extensive set of hearings in 2003-2004, resulting in a comprehensive report, Improving Health Care: A Dose of Competition (July 2004), and it has periodic events relating to health care competition.
U.C. Hastings College of the Law maintains this blog on healthcare price and competition.