> My Ultra5 appears unstable with netbsd-2-0, though - I set it building
  > some stuff from pkgsrc and it wedged (it's remote now).
  > I may try running NetBSD/sparc userland on it.
  > 

  Did it just hang, or did you hit the "sleep sleeps forever" bug?
  I hit that recently on my Ultra 1, running -current. I haven't hit it
  with 2.0_BETA on the same machine, though, and I've only hit it once
  on my Ultra 5 (current) which has been running 24/7 for a long time
  now.

I don't know.  It was reported to me that it was totally unresponsive
to the console.

Does running sparc userland and the SUN4_U kernel from the
netbsd/sparc install avoid this problem?