[QUOTE BY= MacTroll] Looks like you'll need to set up a secondary LDAP connection to AD, or... scary as this sounds, you could set up a NIS connection between OS X and AD. Is that how you're feeding your other Unix machines?[/QUOTE]
The Unix boxes all bind to a Solaris NIS server. AD is not talking to it in any way currently.
I have bound apple clients via NIS before. As in they auth to our Solaris backend. There have been some issues with NFS performance/stability and user home dirs that made me look for other ways of integration (AD). I will look into a secondary LDAP connection to AD from the mac. hopefully someday soon we will be off of NIS completely and on openLDAP. Thanks.