The Microsoft Active Directory Topology Diagrammer is back in a fresh new release from June 2011, a must-have tool for anyone with an AD infrastructure beyond the basic setup that wants to get a birds-eye view of their AD topology with the click of a button.
Requires Microsoft Office Visio and lots of coffee :)
Download on http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=13380
While you're at it...why not also give the Microsoft IT Environment Health Scanner a whirl or listen to the gospel of the AD Rappers using the Risk and Health Assessment Program for Active Directory (ADRAP) Scoping Tool. Word.
Very nice. How does one go about creating a tool like this? It would be very helpful in creating documentation for other systems as well.