Google did release Closure, a cross-browser javascript kit. http://code.google.com/closure/library/ http://code.google.com/closure/library/ Also, GWT. Probabl

Google did release Closure, a cross-browser javascript kit. http://code.google.com/closure/library/ http://code.google.com/closure/library/ Also, GWT. Probably doesn't go far enough for "easily make user interfaces" though.