These guides are intended primarily for advanced researchers in international human rights law. If you wish to investigate human rights case law (judgements from an international court) consulting these is a good way to start.
An Introduction to the History of International Human Rights Law. An online overview of the history of international human rights law.
Bayefsky.com. Well organized site provides reports, concluding observations, ratifications, reservations and declarations, jurisprudence and other types of documents on the major U.N. human rights treaties. It is searchable by type of document, country or subject. See especially the section on Jurisprudence which is excellent for finding documented cases of international human rights violations.
Civil Rights in the United States. Excellent guide from the University of Minnesota Law School.
Electronic Information System for International Law (ESIL). Comprehensive guide to international human rights law on the Interent. See the sections on Human Rights and Humanitarian Law.
Georgetown Law Library Human Rights Research Guide. Excellent human rights law guide, from the library serving the Georgetown Human Rights Institute.
Researching International Human Rights Law. Guide by Marci Hoffman, UC Law Library. See also her guide on International Human Rights and other guides, e.g. on International Humanitarian Law.
Harvard University Human Rights Research Resources. Exhaustive guide to international human rights research from the Harvard Law School Library.
Human Rights Internet. International network of human rights organizations, documentation centre, and a publishing house. This site contains a lot of everything including UN documents, education materials, resource guides and lists of links.
University of Minnesota Human Rights Library. Contains collection of many of the most important international human rights treaties and other instruments. These documents can be accessed by subject matter, instrument list, or by using one of the search mechanism.