WTO Dispute Settlement: Status of U.S. Compliance in Pending Cases [Updated August 14, 2007] [open pdf - 359KB]
"Although the United States has complied with adverse rulings in many past World Trade Organization (WTO) disputes, there are currently 11 cases in which rulings have not yet been implemented or the United States has taken action and the dispute has not been fully resolved. A WTO Member found to have violated a WTO obligation will generally be given a reasonable period of time to comply. While the Member is expected to remove the offending measure, compensation and temporary retaliation are available if the Member has not complied by the established deadline."
CRS Report for Congress, RL32014
U.S. Dept. of State, Foreign Press Centers: http://fpc.state.gov/