The International Criminal Court (ICC) is a judiciary body that tries cases of genocide, war crimes and other "crimes against humanity." The leading instrument for creating the court is a treaty known as the "Rome Statute," which enters into force on July 1st, 2002.
The ICC website provides much of the key information, including the Rome Statute and Regulations governing the operation of the court. The court posts cases referred to the Court since 1946, including information about pending cases.
The WorldLII posts a free searchable database of international case law including ICC decisions (2004-past quarter) and transcripts (2005-past quarter) from the ICC web site.
The Georgetown Law Library posts an Article 98 Agreements Research Guide, which concerns the surrender of citizens by a country to the ICC.
For more ICC materials, see the International Criminal Courts research guide by the SMU Deadman School of Law Library and the "International Criminal Court" section of International Criminal Law: A Selective Resource Guide.