The Justice Project, http://justice.policy.net/

The Justice Project's Campaign Against Wrongful Executions is intended to educate Americans about flaws in the capital punishment system. 

The website contains A Broken System: Error Rates in Capital Cases, 1973-1995, by James Liebman, Jeffrey Fagan, and Valerie West (also known as the Liebman Study). Also included is the text of a pending federal bill, the Innocence Protection Act of 2000.

Other websites on this same issue include:

• Innocence Project Northwest, http://www.law.washington.edu/ipnw/. "IPNW attorneys provide pro bono representation to inmates who are wrongly convicted of serious crimes, who no longer have a right to counsel and where there is a cognizable claim of actual innocence." The IPNW is associated with the University of Washington School of Law.
• Cardozo Law Innocence Project, http://www.cardozo.yu.edu/innocence_project/index.html. "The Innocence Project provides pro bono legal assistance to inmates who are challenging their convictions based on DNA testing of evidence, though clients must obtain finding for testing."
• Truth in Justice, http://www.truthinjustice.org/. "Truth in Justice is a non-profit organization working to free wholly innocent men and women convicted of crimes they did not commit, and to prevent wrongful convictions by alerting the public to the vulnerabilities in the U. S. criminal justice system that make these miscarriages possible."