Alliance for Justice

Their Judicial Selection Project is an unbeatable resources on right-wing judicial nominees.

http://www.afj.org
Americans United for the Separation of Church and State

One of the leading organizations protecting the separation of church and state, with excellent research on the Christian right published in their monthly magazine, Church and State.

http://www.au.org/site/PageServer
Campaign to Defend the Constitution

An online grassroots movement combating the growing power of the religious right, using email action alerts to fight for the separation of church and state, individual freedom, scientific progress, pluralism, and tolerance.

http://www.defconamerica.org
International Planned Parenthood Federation

Dedicated to expanding access to full reproductive rights for people around the world; outspoken opposition to the global abortion gag rule.

http://www.ippf.com
Jews on First

Excellent, well reported Jewish group blog covering the Christian right, Islamophobia, incursions on church/state separation, and more

http://www.jewsonfirst.org/
Military Religious Freedom Foundation

Founded by Michael Weinstein to combat coercive Christian proselytizing and religious discrimination inside the U.S. military.

http://www.militaryreligiousfreedom.org/voices.html
Muzzle Watch

Muzzle Watch tracks efforts to stifle open debate about US-Israeli foreign policy.

http://www.muzzlewatch.org/
NARAL Pro-Choice America

Works to defend access to abortion and birth control.

http://www.prochoiceamerica.org/about-us
National Gay and Lesbian Task Force (NGLTF)

Organizes opposition to homophobia, including opposing a Constitutional Amendment barring same sex marriage, and exposes anti-gay Christian right propaganda such as the “ex-gay” movement.

http://www.thetaskforce.org
People for the American Way

Defends democratic pluralism and opposes the agenda of the radical right; excellent backgrounders on Christian right organizations, conservative judicial nominees, and more.

http://www.pfaw.org/pfaw/general