Websites:

Boston University Law Library: Foreign Legal Research
Links to treaties and trade agreements from the region as well as websites with legal information for specific countries.

Coalition for the International Criminal Court
ICC ratification information for individual countries as well as reports on cases within each country and region.

Constitutions of the Americas
Full text of constitutions of Latin American and Caribbean countries.

Library of Congress: Nations of the World
Provides links to online laws in English, plus legal research guides and general governmental and political links for specific countries. 

United States Institute of Peace: Peace Agreements Digital Collection
Full text of peace agreements for selected Latin American countries.

WashLaw: Legal Research on the Web
A web project based at Washburn University School of Law with links to law research resources for individual countries and regions.