InfoQ has a Nice Article on the Shoal Clustering Framework (see TA entries). The article is based on interviews with Shreedhar and Mohamed and covers a fair amount of material including comparisons with Terracotta, JGroups, JBossCache, ehCache and SailFin.
Shoal is making good progress; I had missed that it is also used by JoNAS. Also see a short note at OpenLandscape.
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