There's been recent discussions about whether a tree structure (as in the current JBossCache) or a flat (hashmap based) structure would be preferred by developers. We're interested in getting feedback from the community. There is a poll and discussion forum at http://www.jboss.com/index.html?module=bb&op=viewtopic&t=145055, we're glad for feedback and comments. Cheers, -- Bela Ban Lead JGroups / Clustering Team JBoss - a division of Red Hat