Hi,
You can join Linux servers and workstations into an Active Directory environment. I have used a product called Likewise-open in the past. From their website:
Joins non-Windows systems to Active Directory domains in a single step from the command line or from a GUI
Authenticates users with a single user name and password on both Windows and non-Windows
Enforces the same password policies for non-Windows users and Windows users
Supports multiple forests with one-way and two-way cross forest trusts
Caches credentials in case your domain controller goes down
Provides single sign-on for SSH and Putty
Next-generation authentication engine that supports Kerberos, NTLM, and SPNEGO
No schema changes to Active Directory required
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