The FBI Law Enforcement Bulletin is published monthly by the Federal Bureau of Investigation.

    http://www.fbi.gov/publications/leb/leb.htm

Law Enforcement Officer Affairs is a Law Enforcement Message Board (Blog) Site.

  http://www.leoaffairs.com/home/

Law Enforcement Today is a Law Enforcement Message Board (Blog Site.

 http://www.lawenforcementtoday.com/

Hendon Publishing offers Law and Order Magazine which covers leading law enforcement issues. 

Law and Order 

LawEnforcementMagazine.com offers U.S. Police News and International Law Enforcement news.

 http://www.lawenforcementmagazine.com/

Law Enforcement News, a publication of John Jay College of Criminal Justice (CUNY).

  http://www.lib.jjay.cuny.edu/len/

LawOfficer.com offers information on tactics, technology and training for the law enforcement professional, Law Officer provides the quality information needed to get the job done safely and effectively.

  http://www.lawofficer.com/index.html

Harley Davidson offers the Motor Officer Magazine which addresses fundamental issues for officers assigned to a motor unit. 

Harley Motor Officer

Officer.com is a central source for the latest law enforcement news. 

http://www.officer.com/

Police - The Law Enforcement Magazine, has an online portal for cops and offers news, and training links. 

http://www.policemag.com/Default.aspx

Police Chief is the official publication of the International Association of the Chiefs of Police.

  http://policechiefmagazine.org/

Monster has a news plug-in of the latest Law Enforcement News stories. 

 http://policelink.monster.com/ 

A magazine and website for K-9 Police Officers.

  http://www.policek9magazine.net/

PoliceOne joins with officers, departments and agencies across the nation in the shared mission of ensuring officers have the tools and information needed to stay safe on the streets and more effectively protect their communities.

http://www.policeone.com/

The information source for law enforcement and homeland security issues.

  http://policeandsecuritynews.com/

S.W.A.T. Magazine doesn't offer extensive on-line articles, but print subscriptions are available and allow full access.  A great source for S.W.A.T. related tactics and news. 

http://www.swatmag.com/

Tactical-Life.com offers the latest in tactical applications and firearm review. 

http://www.tactical-life.com/

Yahoo offers a plug-in for the latest in Law Enforcement news. 

http://news.yahoo.com/topics/police-and-law-enforcement