This op-ed from last Sunday's Los Angeles Times speaks eloquently to the need for corporate liability in international human rights cases. In it, Ka Hsaw Wa, the executive director of EarthRights International, describes the human rights abuses committed by Unocal and the Burmese military that prompted the Doe v. Unocal suit settled in 2005 following almost a decade of litigation.
Also, the LA Times editorial board gets it right in this editorial, which concludes, "As long as U.S. courts are open to such [human rights] suits, there should be no distinction between individual and corporate defendants."