Get it here
Just got the toolkit up and runing along with a project in Eclipse. I have been trying all sorts of javascript libraries trying to develop a satisfactory AJAX PoC for a while now. I was not very happy with the results.
With the Google Web Toolkit, I (mostly a java guy) was able to get a basic 'Hello World' AJAX application running in record time. Eclipse integration is simply great, which brings in the ability to debug AJAX applications in a 'civilized' manner, among other things.
The documentation and the samples were very helpful in ramping up. I'm now looking at the RPC and the surrounding architecture. I think this would be the toolkit that made AJAX 'usable' for a broader subset of developers.
Hope to see great things in the coming days ....