Hi, I'm sorry, if that post confused you, I deleted the whole server and reinstalled a jboss-4.0.4.GA with jboss-messaging-1.0.1.CR1 and the mdb example worked immediately. That must have been some kind of misconfiguration in the old deployment tree.
I must say, once I understood a little bit the configuration and the whole idea of jboss-messaging it's a very nice thing to have! I hope very soon in near future. I'm eager to read more tutorials! I think, it's very important to have working tutorials with each of the products.
cu - Michael