Been working with ZFS and Solaris Containers a lot, as of late. We're moving our entire environment from Storage Foundation 4.0 to it, as a matter of fact. We never "really" utilized the majority of the clustering capabilities, anyway, as the app admins "have" to manually manage their applications, during a fail-over (bad app design, in my opinion, but whatever).
Keep an eye out on for the next few weeks for notes on ZFS, Zones (Containers) and working with Oracle 10g with ASM and portability across the SAN for zone detaching and zpool exporting. Fun stuff! I'll "brain dump" everything that I've been keeping notes on, here.