Matt Harrison wrote to me recently, to notify me about a guide he’d written showing how to integrate a ZFS-based OpenSolaris fileserver with Microsoft Active Directory.
His guide covers all the necessary areas like: configuring Kerberos, synchronizing time/dates, enabling the CIFS server, joining the domain, user and group mapping, ZFS datasets, setting ACLs and auto-sharing home directories.
You can read his guide here: Active Directory Integration
This guide will no doubt be very useful for those trying to do the same.
He also wrote a blog article to introduce his guide here: Integrating Solaris CIFS with Microsoft Active Directory.