I’ve updated the PDF version of [Modern IDL](http://modernidl.idldev.com) to fix some typos. If you bought a copy of the PDF, you should receive an email this weekend (to the email address used to buy the book) with instructions on downloading the new PDF. I’ve included an omitted program from the example programs also, so follow the correct download link at [Modern IDL](http://modernidl.idldev.com).