I did a video interview with Eugene Ciurana of The Server Side web site. In the interview we talked about the benefits of GWT and a little about the contents of GWT in Action.
GWT in Action: TheServerSide Tech Brief
The posting as drummed up some lively conversation. Perhaps the best quote in the comments so far is, "GWT style programming is for cowards". I am not sure how using GWT makes me a coward, perhaps not writing code directly in assembler makes me a coward as well. As the immortal Popeye once said, "I am what I am".