samba - May 2004 - 3.0.2a mapping unix W2K AD users

I am running Solairs 8 with Samba 3.0.2a with winbind and pam and want
to be able to map my unix accounts to the same users I have setup under
Windows 2000 AD.  Do I still use the smbusers map, if so can you point
me in the direction?

Thanks 
Julia.