Does anyone have, or know of, any good resources about implementing a Windows/Active Directory Domain in a gateway environment?
Or alternatively any good resources on locking down/securing an active directory domain installation?

The organisation I work for already have an Windows domain implemented in our internal environment but are looking at implementing one in the gateway environment to help manage the servers (including accounts and LDAP, GPO's etc) in that environment. My role is configuration guidelines and advice from a security perspective.

I have a few resources from the Microsoft Site (but if you know of a good resource on the Microsoft site let me know in case I have missed it) but I am keen to find 3rd party resources if there are any out there.

Cheers