google web toolkit

Has anyone looked at google web toolkit (
http://code.google.com/webtoolkit/ ) ? I saw a presentation on it this
evening and it was really quite fascinating. In short (for those of us
-most of us I assume - who come from a Java background) it allows you
to take java code, and "compile" it to an Javascript / HTML such that
it is an AJAX user interface. Very cool - I am wondering if anyone sees
a fit wherein something likge GWT can be used within Rails in some
fashion? -Ralph