I posted a review (back in January, this updated review is posted in late May 2008) that slammed Prentice Hall for not making the code samples available from anywhere except through a 90 day free trail thru Safari (an online subscription based service).
The editor and one author responded and let me know that the site was incorrectly missing in the book, but that a site (called coolandusefulgwt with the obvious ending.) was available and has all material easily downloadable. I have checked out this site and confirmed that the code is indeed available. It is a very cool site in that it the entire site (or most of it) is a GWT application!
I applaud the editor and authors efforts to inform me and other purchasers of the book... and they also explained that the susbscription based service is not going to be the sole method to get code from Prentice Hall books...which is even better news.
I am giving this book 5 stars as it is a very good book for GWT beginners and intermediate programmers... escpecially those looking for info on custom widgets/controls. The authors did a splendid job of presenting the material in a well layed out manner, The book takes the GWT (sparsely documented by Google) and make it alot more accessible to the programming community.
Now that the source code (and more) are available on the new site, there is no reason why anyone interested in studying GWT would not want this book in their personal library.
In fact, if you are looking to buy this book, and are on the fence, go check out the website and you will get a good idea of what this book will do for you and I think it will help you make an informed decision to buy this great resource.