American Press Institute
http://www.americanpressinstitute.org
American Society of Newspaper Editors
http://www.asne.org
The Journalist's Toolbox
http://www.journaliststoolbox.org/
Power Reporting Archives (links to a variety of web sites arranged by beat) http://powerreporting.com
The Poynter Institute
http://www.poynter.org
Society of Professional Journalists
http://www.spj.org