*UPDATE*
newer version security = share doesn't work
use:

security = user
map to guest = Bad User

-------------------
vi /etc/samba/smb.conf

and set interfaces to lo and your local network interface. In my case: eth1.

interfaces = lo eth1
bind interfaces only = true

Now, it is time to smoothen samba default security by changing the security variable:
security and make sure it is set to share instead of user and that guest account is enabled:

security = share
...
...
guest account = nobody

Now, we can create a share to be accessible to guest users:

[Guest Share]
        comment = Guest access share
        path = /path/to/dir/to/share
        browseable = yes
        read only = yes
        guest ok = yes

You can now test that your configuration is good using testparm:

$ testparm

If everything is fine, it is time to reload samba service to have your new configuration taken into account:

$ /etc/init.d/samba reload

-------------------------------------------

disable printing 

add this to /etc/samba/smb.conf

     load printers = no
     printing = bsd
     printcap name = /dev/null
     disable spoolss = yes