adobe.com :
The new Adobe AIR
runtime enables Ajax developers to build rich Internet applications (RIAs) that
deploy on the desktop. AIR applications run across operating systems on the
WebKit HTML engine and are easily delivered using a single installer file. With
Adobe AIR, Ajax developers can use their existing skills and code to build
responsive, highly engaging applications that combine the power of local
resources and data with the reach of the web.
I think it is possible to run a GWT application on the AIR runtime. I would
be interested to know anyone's experience in implementing it.
http://www.adobe.com/products/air/develop/ajax/