My colleague Joseph recently wrote about cluster management in upcoming RHQ 1.2. Don't confuse this with the cluster work we have done for RHQ 1.1, where we added the clustering of the RHQ server itself.
The goal in RHQ 1.2 is to be able to cluster resources together and operate on them. You will probably say that this is already possible with compatible groups. But this is only half of the truth. Go and read Joe's posting.
In addition to the RHQ side, we will also work on clustering JBoss AS servers in the Jopr project. I have set up an initial requirements document for this. I am looking forward to your comments on this.
Managing a cluster of JBossAS servers includes a big part of managing JBoss Cache instances and their underlying JGroups infrastructure.
I've started a JBoss Cache plugin for Jopr some time ago. If you are interested, check it out and use it in RHQ / Jopr and Embedded Jopr.