I've just blogged about the upcoming 3.1.0 release, as well as a 3.0.3 bugfix release here:
http://jbosscache.blogspot.com/2009/02/what-to-expect-in-jboss-cache.html
Read all about it! :-)
Cheers
--
Manik Surtani
Lead, JBoss Cache
http://www.jbosscache.org
manik@jboss.org