Cops and Dead Guys
Royal Canadian Mounted Police --Homepage for the guys and gals in red serge.
Federal Bureau of Investigation --F...B...I...
Metropolitan Police of London --Also known as Scotland Yard.
Crime Scene Investigator Network --Guidelines, articles, how to collect evidence etc.
CanLII --The Federation of Law Societies of Canada makes Canadian law accessible for free on the Internet. Check out cases and statutes.
Forensic Science Resources --Definitions and links for crime scene investigations, arson, anthropology, etc.
Lots of links to many specialties that fall under the umbrella of forensic science. [Ed: Thanks for the tip, Lucas!]
Crime Spider --Crime Spider crawls the web in search of crime and law enforcement websites.