Cornell Legal Information Institute Immigration Provides a good starting point for research on immigration law. This site gives a brief history of immigration law in the United States and links to relevant federal statutes and regulations.
U.S. Citizenship and Immigration Services Provides information on how to obtain citizenship, employment authorization, adoption, green cards, medical examinations, and how to find legal advice as well as forms for immigration matters.
Executive Office for Immigration ReviewThis department handles appeals from immigration judge decisions. Its website has immigration appeal forms, recent immigration appeals decisions, and a list of free legal service providers.