After nearly five years of writing on nights and weekends, I have finally finished Modern IDL, my book about all things IDL. The book is at the printers now and should be available on Tuesday June 14!
See the Modern IDL website for the table of contents, a sample chapter (object graphics!), all the code examples, and, on June 14, a link to buy the book. The book discusses, with many examples, topics such as object-oriented programming, file input/output, networking, widget applications, direct graphics, object graphics, new graphics, external development, and performance.
The book will be available spiral bound and in PDF. I put a set of photos of the book on Flickr.