1)   Inactive Users for Active Directory 1.4
Identify, move and disable inactive users in your Active Directory Domain. All domain controllers are scanned for the lastLogon data, so you you can be sure the days of inactivity are accurate. Users that have never logged on are also indentified.

 2)   JiJi Active Directory Cleaner 5.0
Schedule a policy for inactive users auto deletion or notification via email. You can scan your AD for inactive users, disabled users, inactive computers and disabled computers.