Ebook: Accelerated GWT: Building Enterprise Google Web Toolkit Applications

I found this book to be a quite good accelerated overview. It covers all the core concepts (RPC, widgets, projects, CSS) with useful and understandable examples. It covers advanced topics like custom serialization, the details of CSS, and a lengthy piece on internationalization with a good localization example.

In comparison, GWT in Practice (although a good book) left me not understanding the client side as well as I'd like. The criticisms from the other reviewers are fair, but this book deserves a much higher score. It was worth the time I put into it.

GWT 2.0 is out, and this is still a good book. The UiBinder is not covered, of course, but the core concepts are still mostly relevant with only a few deprecated topics covered.