If you are serious about scripting you should use Rorohiko's Active Page Item Developer (APID) Toolkit.
InDiScripts — site published by Marc Autret, developer and graphic designer at StudioEditorial (France).
Peter Kahrel's free InDesign scripts.
www.ps-scripts.com — forums, articles, sample codes, tips and tricks on Photoshop scripting.
Check out Bob Stucky's Creative Scripting blog.
InDesign snippets — a blog by Marijan Tompa, a graphic designer from Subotica (Serbia).
InDesignScript.de — a site with scripting examples, tutorials, and a good collection of scripts (in German).
Here are some interesting resources on using XML in InDesign:
Designer's Guide to Adobe InDesign and XML by James Maivald and his course on Lynda.com
XML Publishing with Adobe InDesign by Dorothy Hoskins
Tutorials on AcrobatUsers.com
Extendables by Stijn Debrouwere
Basiljs making scripting in InDesign available to designers and artists.