Flannigan is a good author, I find his books to be well written and very useful. As an author myself, its sad to see. I know that the first time I saw a student reading my textbook book for free on Google it almost floored me.
I don't write textbooks to make a lot of money, so its not like google is depriving me of a huge income, but there is that kick-in-the-gut feeling that someone has completely devalued your creation when you see it out there for free. Its like, come on, I worked hard on this book for two years, putting all of my best thinking and ideas into it and you can't even bring yourself to pay the $45 for it?