Lots of blogging by Sun engineers
Sun engineers have put together 60+ (so far) blogs covering h/w, Solaris, performance and scaling, tuning tips, best practices, RAS about UltraSPARC T1, the SunFire T1000/T2000 systems and OpenSPARC.
You can start with Richard McDougall's index blog at:
http://blogs.sun.com/roller/page/rmc?entry=welcome_to_the_cmt_era

