Well, NetBSD on my Sun Ultra 10 was no go. I got it installed okay, and it would run...for awhile. But eventually it would lock up, faster if I were doing something intensive (like compiling the kernel) and slower if the machine was just idle. I'm not upset because I didn't expect much anyway. Sun's machines have always been hard to support in OSS because Sun doesn't help much with the porting effort -- their attitude is "why aren't you running Solaris"?

I'll keep fooling around with the Ultra 10 when I have a bit more time; there's bound to be a BSD that works on it.