So, no one has done this and the developers do not know?
Well, JBoss Messaging 1.0.1 doesn't support clustering, per-se. I don't think anybody's deployed this way.
Correct... JBoss Messaging 1.0.1 doesn't support clustering yet.
1.2.0.Alpha2 has the support of Clustered Queues and Topics (without HA yet). But that's non production ready yet.
We are working on HA and that should be ready by the end of this month.