at Coraid, we have two cpu servers that run daemons
and provide machines for the folks who have to run
other systems (bsd, linux).  we also have a terminal server
to get to consoles.  since our SATA+RAID product runs
Plan 9 you could say we have a good many cpu servers.

however, we don't use the servers
as a fast place to run programs.

  Brantley