I'm still running 1.0 (yeah) and occasionally get stuck disks.  Like right now.
My "exmh" is stuck trying to run "scan", and another window hung when I tried
to do a "cd Mail/inbox", so that disk (/usr/local) is hosed.  ps -alx shows

  UID   PID  PPID CPU PRI NI   VSZ  RSS WCHAN  STAT TT       TIME COMMAND
 1074  2978  2946  22  -5  0   460  712 vflush D    ??    0:00.52 scan +inbox -
 1074  2949  2942   0 -14  0   584 2252 988c00 Ds+  p2    0:00.94 -csh (tcsh)

for the two stuck processes.  There's no driver feedback, so I have no idea
whether the disk is out to lunch or there's a driver problem and it's stuck
(the driver, that is).

Reboot time ...

	- Greg