MVC in the browser

MVC in sever side is awesome and is provided by default in Rails but having an MVC at the client side (browser) is something I was looking for some time. It seems that GWT takes the pain out of client side software development and provides mechanims to do MVC for rich user interfaces.
There is a chapter on MVC in GWT in chapter 2 (). I was able to host the calculator app on my google app engine site at Max. I copied the code examples from http://www.manning-source.com/books/cooper/gwtip_code.zip and then fired/built/tested on eclipse with pure Java development cycle and copied over the generated javascript/html/gis/css on to google app engine. The product was instant hit to me