You surely know by now: JBossON 2 is built on top of RHQ.
JBoss is now providing a free trial version of JBoss ON 2 at http://www.jboss.com/products/jbosson. Sign up at the link provided there and see JBoss ON 2 in action. This also includes plugins for monitoring JBossAS
Support for that trial is through the forums at http://www.jboss.com/index.html?module=bb&op=viewforum&f=285.