If I name any share "Public", no matter what the other settings are, Windows clients cannot access it.  They report "\\hostname\Public refers to a location that is unavailable. It could be on a hard drive......."

Here's my config:

[global]
   workgroup = MSHOME
   server string = %h server (Samba, Ubuntu)
   dns proxy = no
   log file = /var/log/samba/log.%m
   max log size = 1000
   syslog = 0
   panic action = /usr/share/samba/panic-action %d
   security = share
   encrypt passwords = true
   passdb backend = tdbsam
   obey pam restrictions = yes
   guest account = nobody
;   invalid users = root
   unix password sync = yes

# For Unix password sync to work on a Debian GNU/Linux system, the following
# parameters must be set (thanks to Ian Kahan <<kahan@informatik.tu-muenchen.de> for
# sending the correct chat script for the passwd program in Debian Sarge).
   passwd program = /usr/bin/passwd %u
   passwd chat = *Enter\snew\sUNIX\spassword:* %n\n *Retype\snew\sUNIX\spassword:* %n\n *passwd:*password\supdated\ssuccessfully* .

   socket options = TCP_NODELAY

[Public]
	path = /mnt/big/stuff
	browseable = yes
	read only = yes
	guest ok = yes