>Has anyone implemented (successfully), or heard of, any ActiveDirectory or >eDirectory kind of scenario w/ Linux boxes? Yes, using OpenLDAP (http://www.openldap.org). LDAP PAM and NSS modules are available, as is LDAP support in Samba (HEAD or TNG, not 2.0.x), Apache, PHP, Netscape, Star Office, Squid, sendmail, etc....