Adobe InDesign
   Tips and tricks on a variety of topics (PDF).
   http://www.adobeevangelists.com/indesign/06_indesign.html

InDesign CS2 Advantage Center
   Articles, tutorials and tips provided by Layers magazine.
   http://www.layersmagazine.com/indesign.html

InDesign Help
   Support, Troubleshooting, Tutorials, and News about Adobe InDesign.
   http://indesignhelp.com

InDesign Scripting Reference
   Use this online reference for programming Adobe InDesign software. Choose either AppleScript, JavaScript, or VBScript.
   http://www.indesignscriptingreference.com

InDesign User Group
   Provides information about upcoming user group meetings, news and professional opinions about the industry, and learning tips about the software.
   http://www.indesignusergroup.com/

InDesignSecrets.com
   Developed by David Blatner and Anne-Marie Concepcion. Provides articles, podcasts and videocast from various contributors.
   http://indesignsecrets.com/