Recently a couple of enhancement for zones have been integrated into the OpenSolaris source.
PSARC/2010/132 Delegated Administration for Zones
This will make it possible to delegate administration of local zones to user with not-superuser privileges. This will add three new privileges: solaris.zone.clonefrom for cloning zones, solaris.zone.login for zlogin and solaris.zone.manage for zone management.
PSARC 2010/144 lofi(7D) in non global zones
Will make it possible to use lofi, the loopback file driver inside a local zone.
Talks I have given
2 weeks ago