I'm planning on migrating a few of our Linux servers to use AD authentication via SAMBA/Winbind. Operating system will be openSUSE 11.3 x64. Our AD environment does not have UNIX extensions ...

It's been quite a while since I've set up winbind auth, but I dug up a doc I wrote back in 2002. It was for samba/netatalk, but the principles should be much the same.