BD's favorite IDL sites:

• Exelis Visual Information Solutions (the IDL company; can download IDL or latest documentation here).
• Searchable List of over 3000 IDL Routines, including source,
  or search the IDL Newsgroup at http://groups.google.com/group/comp.lang.idl-pvwave
  
• Fanning Consulting IDL Pages
• IDL 5.0 Procedures in astrolib
• Notes on Interpolation in IDL
• IDL FAQ (from 1999).
• IDL 5.1 Documentation in HTML Format
• IDL tutorial from University of Virginia
• IDL user-written routines used at PPPL

Edited 6-Dec-2012 by: Bill Davis