Sun V20z is a Newisys 2100
I just discovered that the Sun V20z dual Opteron systems are actually developed and produced by Newisys.
Newisys apparently is a extremely pro-Linux company. Not just for marketing purpose, but they mean it. They release all drivers (IPMI, jnet, ...) under the GPL, even actively contribute them back to the free software community.
They're even looking into running LinuxBIOS on their boxes... While LinuxBIOS is actually an improvement, I'd rather like to see OpenFirmware. What is the point of putting Linux there? OpenFirmware provides you with whatever you need, even device-drivers written in forth / f-code. Well...