The U.S. International Trade Commission "provides trade expertise to both the legislative and executive branches of government, determines the impact of imports on U.S. industries, and directs actions against certain unfair trade practices, such as patent, trademark, and copyright infringement."
The Commission's Web site provides information about the Commission and its publications, investigations and cases (www.usitc.gov). Documents filed in ITC cases are available through the EDIS system.
The ITC has an RSS Feed Generator that notifies you when petitions, complaints and other documents are filed with the ITC. Otherwise, you can just check the docket notification page periodically, or use a system like Change Detection to track changes for you.
ITC opinions and other documents back to 1975 are searchable on Westlaw (FINT-ITC).
The U.S. International Trade Library on HeinOnline contains a large collection of ITS materials going back to 1966. Many concern Section 337.