A Java-based "AJAX" toolkit from the minds at Google.
http://code.google.com/webtoolkit/
If it's like their other WebAPIs it should be fairly easy to use and well documented.
ROFL -- I just went to the RW forum to post the following (been a busy day, just now took a break)
" code.google.com/webtoolkit contains documentation, examples, and a download for Google's AJAX Web Development platform.
You create your application in Java, and Google's proprietary code compiles it into HTML with JavaScript. Neat."
^ Also see Slashdot discussion ( http://developers.slashdot.org/article.pl?sid=06/05/17/127214 )
(linked from http://billstclair.com/blog/ )
:P ya beat me, Mr. Slashdot addict ;)
- - -
The GWT guys also have a blog: http://googlewebtoolkit.blogspot.com/