Other IDL Resources
 
ITT Visual Information Solutions (formerly Research Systems, Inc.) is the developer of IDL. You can get information about IDL and other ITT Visual Information Solutions products and download a trial version of IDL software.
The Usenet news group comp.lang.idl-pvwave is a high-quality, low volume newsgroup to which many IDL experts contribute regularly. You can view the newsgroup here or with your favorite newsreader. Don't confuse this group with comp.lang.idl, which is devoted to an unrelated software system (Interface Definition Language) that is also known as IDL.
One of the oldest, largest, and most useful libraries of IDL software available.
David's web site has a great collection of IDL programming tips, sample programs, and links to other IDL resources. David is a long time IDL developer and training consultant. You can buy his book, IDL Programming Techniques, and other IDL-related books.
An expert on IDL graphics and author of several IDL books.
An excellent IDL book for more experienced programmers.
A former RSI training instructor and consultant.
IDL astronomy-related web sites
  1. NASA Goddard Space Flight Center IDL Astronomy Users Library  - A large library of general purpose and specialized astronomy routines.
  2. Mac Singularity - A website devoted to IRAF, IDL, and Mac OS X
 
IDL Library Browser, by Eric Deutsch
A list of a large number of publically-available IDL libraries.
An Australian consulting company.  Their web site has several extensive lists of IDL-related links.