So does Sol 10/09 have the newer version of gnome and updated theme from Opensolaris? I've been using b125 of SXCE on my b2k. Never been a huge gnome fan but it's starting to become bearable and some things like SunPCI software require gnome or cde.
As an FYI there seems to be a glimmer of hope that us SPARC users will be able to use XVR-500/600/1000/1200 with Solaris 11 and Opensolaris. Apparently is seems possible that the XSun stuff might be able to be grafted on top of an OS or Sol 11 install. There is the beginnings of a project to package XSun into a separate install package to make that process easier. Sorry I can't find a link the forum thread and project wiki, but it is real.
There is apparently a driver for the XVR-2500 in the works for Xorg. Alas, since it's a PCI-E card and bloody awful expensive, that doesn't help us Ultra and Blade users. (Or, well, anyone except those few with Ultra 25/45 machines...)