There's a hornetq plugin that's developed and maintained by the HornetQ team - it can be used to manage HornetQ deployed inside AS 6.0 or EAP 5.1. It is included with the admin console in JBoss AS 6.0 M3 and later and will also be included with JBoss EAP 5.1's admin console. Though the plugin is not included with the RHQ 3.0.0 distribution, it is compatible wiith it.
The source for the plugin can be found here:
Thanks for the reply, i've just downloaded it from svn.