Using AD within Linuz for authentication

Does Active Directory top Linux authentication options?

http://searchenterpriselinux.techtarget.com/originalContent/0,289142,sid39_gci1279624,00.html

Integration issues between Linux and Active Directory discussed by Enk (Gartner) – metadirectories and other solutions – LDAP and Kerberos are discussed as a disadvantage because most organizations do not have people with LDAP expertise -

“cross-platform authentication market will probably remain in flux until at least 2009”