Chicago Police Department
Heavy Badge, a great site dealing with the burdens of police work
Une Flic, an interesting blog on police work and other matters by retired cop Jill Wragg
Criminal Justice Resources, Florida State University
The Nathanson Centre for the Study of Organized Crime and Corruption, an academic site covering all aspects of organized crime
American Mafia, a site covering traditional organized crime
The Book Cellar A fine independent bookstore in Chicago's Lincoln Square neighborhood with attached wine bar. Now there's a great concept.
Mystery One, Richard Katz's fine Milwaukee store.
Otto Penzler's Mysterious Bookshop, a great mystery bookstore in New York
Mystery Writers of America
Readers' Circle
The Outfit, a collective blog by some good Chicago crime writers
Tim Broderick Comics artist Tim Broderick does crime stories. Cool stuff.
Can't Stop, Won't Stop Check out California writer Sophie Littlefield's wide-ranging blog.