Quick note for future reference: the document for ES2 (http://help.adobe.com/en_US/livecycle/9.0/clustering_jboss.pdf) explains how to change the necessary ports in order to get a vertical JBoss cluster up and running.  In ES3 (and therefore JBoss 5) the paths for a number of the ports has changed:

JBoss 4:
jboss-service.xml file located in [appserver root]\server[profile]\conf

JBoss 5:
bindings-jboss-beans.xml file located in [appserver root]\server[profile]\conf\bindingservice.beans\META-INF