IDL Seminar - This page has examples of basic commands used in IDL.
Output - this page lists the commands in the seminar with the output produced. Not as good as doing it yourself, but useful as a quick reference.
Image Page - these images will be referred to during the course of the seminar.
David Fanning's Webpage - once you've become more familiar with IDL, this website is a treasure trove of useful hints and helpful programs for the more experienced user.