IDL users group presentations
2008 presentation2009 presentation2010 presentation
ExelisVIS www.ittvis.com is the developer of IDL. ExelisVIS maintains links to other sites, a user code base, and a tech support page.
David Fanning (www.dfanning.com) is one of the great IDL teachers and writers. His web site has dozens of excellent example IDL programs.
Craig Markwardt (http://cow.physics.wisc.edu/~craigm/idl/idl.html ) has some absolutely outstanding curve fitting and array manipulation routines.
RIck Towler (http://www.acoustics.washington.edu/~towler/)is one of the experts in IDL 3D object graphics. His camera object is a regular part of all our projects.
Using Python From IDL is HERE! 2012 Christmas Card is HERE! Object Oriented Programming with IDL is HERE!