nsswitch.conf issues with LDAP Auth?

Hello all,

I seem to be having some issues with getting auth requests to not lookup
the ldap server if the account is local and have tried everthing and am
stumped. Heres a rundown...

What I'm doing:
I have a pair of LDAP boxes, which ~thirty systems are looking up for
authentication via LDAP. Auth all works well. No issues there.

The issue, however is that..
Even with local system accounts (root, www-data, postfix, etc), the
systems are still contacting the LDAP servers, and I just don't see why
(considering I have Files specified first in nsswitch.conf and
pam_unix.so first in all the pam confs). 
Ideally, if the accounts are local, I'd like the systems to say 'ok, we
have our account, now lets not query the LDAP server'

Anyhow, heres my confs:
nsswitch.conf-
passwd:         files ldap
group:          files ldap
shadow:         files ldap
sudoers:        files ldap

hosts:          files dns
networks:       files

protocols:      db files
services:       db files
ethers:         db files
rpc:            db files

netgroup:       nis

common-auth:
auth    sufficient      pam_unix.so nullok_secure
auth    sufficient      pam_ldap.so use_first_pass
auth    required        pam_permit.so

common-account:
account    sufficient   pam_unix.so
account    sufficient   pam_ldap.so
account    required     pam_permit.so

common-password:
password   sufficient   pam_unix.so nullok md5 shadow obscure min=4
max=8
password   sufficient   pam_ldap.so use_first_pass
password   required     pam_permit.so

common-session:
session    optional     /lib/security/pam_mkhomedir.so skel=/etc/skel
umask=0022
session    sufficient   pam_unix.so
session    sufficient   pam_ldap.so

Oh, and software versions:
libldap2       2.1.30-3
libnss-ldap    238-1
libpam-ldap    180-1

Soooo, anyone seen the same symptoms?
Any ideas or sugestions would be very helpful

Regards,

-- 
Daniel Cross                                    
Systems Administrator                           Cell +64 21535975
WorldxChange                                    DDI  +64 9 9501354