Thanks! looks like HA JNDI for me...
ok, I have noticed on one page about clustering, the following statement:
You cannot currently use a non-JNP JNDI implementation (i.e. LDAP) for your local JNDI implementation if you want to use HA-JNDI. However, you can use JNDI federation using the ExternalContext MBean to bind non-JBoss JNDI trees into the JBoss JNDI namespace. Furthermore, nothing prevents you though of using one centralized JNDI server for your whole cluster and scrapping HA-JNDI and JNP."
The last sentence is interesting... "one cetralized JNDI server"... anyone know how?
Actually, I've decided to go with an external context for the JMS server. That seems to work very well for my case.