samba - Nov 2004 - Samba3 and "public = yes"

Samba3 and "public = yes"

I have trouble with samba3 and allowing everyone to access a share.
With everyone I also think of users that are not defined in samba or in
any domain/workgroup.  This is working OK with the old Samba2.

What is wrong with this config in Samba3?

        [public] 
           path = /public 
           public = yes 
           only guest = yes 
           writable = yes 
           printable = no 


Regards Atle