American Enterprise Institute: Neo-conservative think tank supports limited government, private enterprise, vital cultural and political institutions, and a strong US foreign policy and national defense. Includes profiles of scholars, publications and commentary, research area descriptions, annual report, newsletter and bookstore

Brookings Institution: Research and policy institute provides briefing papers, analyses, and other resources

Cato Institute: Think tank dedicated to the principles of individual liberty, limited government, free markets and peace. Its scholars and analysts conduct independent, nonpartisan research on a wide range of policy issues

Council on Foreign Relations: A research center dedicated to understanding the world by better comprehending global trends and contributing ideas to U.S. foreign policy. Publisher of the journal Foreign Affairs

Hoover Institution: Conservative policy analysis group at Stanford University. Site provides library and archives of papers and seminars, description of research areas, publication links, and background on activities

Rand Corporation: Rand Corporation conducts research on important issues such as science and technology, methodology, national security, public policy, justice, health, education, drug policy, and demographics

The Heartland Institute: Official site of the Chicago-based think tank promoting public policy based on individual liberty, limited government and free markets

The Heritage Foundation: Conservative political think tank led by Jim DeMint and based in Washington, DC. Publishes research on domestic, economic, foreign and defense policy