DWR is an Ajax remoting framework for Java to make it easy for web pages to interact with Java classes.  DWR development is sponsored by TIBCO. We are working to enhance Ajax in the enterprise, and to integrate DWR with JBI and JMS.  If you are looking for a User Interface library for DWR that goes beyond dwr.util, then check-out General Interface - an extremely versatile open source UI toolkit. For an example of what is possible with GI, check out the X-Ignite sample application.