Being a server-side tool you will find that it is not easy to find an environment with or that will allow you to apply ColdFusion.
The book is comprehensive on ColdFusion. A side benefit of the book is that it describes the environment in which ColdFusion works. This helped with better web design. Yet the real worth for me is the thorough coverage of LPAP.
I keep this book as a reference in case I need to talk to any ColdFusion folk. However, as I stated above the book covers many subjects better than dedicated books.