DWR can be integrated with JSF, Spring, Struts, Hibernate, Beehive.
So far this short notice. I took an example from the Getahead site and deployed this with maven on a local server. It is a bare minimal chatbox but that consists of just a few code lines(!) I added a weird clear button in just a minute. DWR is intriguing stuff to have a look at when you are interested in Ajax. Check out http://smnserver:8180/chat/ and http://smnserver:8181/svn/repos/chat/trunk.