OpenSolaris 2009.06 is out
I downloaded the OpenSolaris 2009.06 release and installed it on top of VirtualBox over lunch. The previous release (2008.11) had a lot of good desktop support, this version has added a lot of enterprise-class features like automated installations, UltraSPARC support, multi-protocol SCSI target (COMSTAR), crazy-cool network virtualization (Crossbow) and much more. You can check out the full set of new features at: http://www.opensolaris.com/learn/features/whats-new/200906/
While there is always room for improvement, I think given OpenSolaris’ design, feature set, and maturity it is now in a place where I’d consider it a viable option for production deployments on x64 systems. I’d still hold off for a little while on SPARC since I think it may take a bit for all the auto-install and boot-related code to gain maturity there.