About.com: Crime and Punishment - News, essays, and links, including arguments, statistics, and information about specific issues.
Arrested.Com Crime Center - Find stories from the FBI, CSI, and detectives. Includes amber alerts and high profile court cases.
Centre for Crime and Justice Studies (CCJS) - Charity which aims to inform and educate about all aspects of crime and the criminal justice system. Houses a wealth of UK criminal justice links, events, and publications, including The British Journal of Criminology and CJM.
Cold Case Center - Focuses on and aids law enforcement in the solving of unsolved homicides. Lists organizations, references, and news.
Crime Library - Features stories and news on serial killers, the mafia, assassins, and forensics.
Crime Magazine - Encyclopedia features prisons to assassinations, celebrity crime to gangsters, fugitives to the unjustly convicted.
Crime News 2000 - True crime web links including criminal investigations, news archives and resources.
Crime Spider - Search engine that crawls the web for law enforcement and crime related sites.
CrimeWeb - Free web based service which allows the public to access and respond to missing adults, children, major crime and community security alerts which are created and distributed via the site by public safety agencies across the nation.
Detective Talk - Features a message board where you can post messages to help find missing persons and solve crimes.
Smoking Gun - Large collection of public documents on crimes, celebrities, politicians, and the FBI.
TheCrimePortal.com - Web directory includes news, prevention, statistics, law, famous crimes, forensics, corrections, and victims' sites.
True Crime and Justice - Provides a collection of resources and articles on unsolved cases, homicide, forensics, missing persons, victims, domestic violence, drug wars, various types of abuse, and criminal activity.