Microsoft Active Directory Topology Diagrammer
The Microsoft Active Directory Topology Diagrammer reads an Active Directory configuration using ActiveX Data Objects (ADO), and then automatically generates a Visio diagram of your Active Directory and /or your Exchange 200x Server topology. The diagramms include domains, sites, servers, administrative groups, routing groups and connectors and can be changed manually in Visio if needed.
Supported Operating Systems: Longhorn (Windows Code Name) ; Windows 2000; Windows Server 2003; Windows Vista; Windows XP; Windows XP 64-bit
Microsoft .NET Framework Version 2.0
Microsoft Office Visio 2003 or 2007
Link: Download details: ADTD