[Modern IDL](http://modernidl.idldev.com) is now [listed](http://books.google.com/books?id=zAd1Y0-bOrsC&printsec=frontcover) in Google Books! This should make a fair amount of content of the book available for reading online. Even better, you can do text searches of the entire book, which gives snippets and a page number that you can look up in your [hardcopy version](http://modernidl.idldev.com).