Dimitris, the ported JMX-Console looks quite usable, although I miss some nice features like the JNDI View etc. (I think we could add them ourselves, though).
One more question (I'm just getting started with the changes that happened since JBoss 4.x ):
How would I create an MBean that is accessible through the ported JMX-Console?
Apparently, the @Service and @Management annotations are gone.