Oracle VM for SPARC is finally supported by Oracle, you can now partition a system with with logical domains and license hardware available to the domain. This is something Oracle customers have been wanting for a while now and I must say I believed it would have been solved the day Oracle acquired Sun. Nevertheless it's now finally supported at the same time the first T4 systems are being delivered to customers, which must be considered good timing.
Important change regarding OVM/SPARC and Licensing
Talks I have given
5 months ago