Found this handy article in the July 2007 edition of Technet Magazine, describing an excellent Hierarchy mapping tool written up by Jeff Tondt.

Qoute:

A picture is worth a thousand words. This familiar proverb refers to the idea that complex stories can be told with just a single image, or that an image can be more influential than even a substantial amount of text. It also aptly characterizes the goals of visualization, where large amounts of data must be absorbed quickly.

To a System Management Server (SMS) geek like me, seeing the whole SMS hierarchy in one picture helps me understand how my infrastructure is laid out. You could use such a picture, perhaps, to show the before and after of an SMS migration plan to management. In certain troubleshooting cases, such a diagram could be very useful in finding a solution or at least in getting help from others. And, of course, as a responsible SMS administrator, you need to document your system hierarchy for all sorts of other reasons.

SMSMap V1.0

It has some dependancies, such as DOT NET and Visio etc ...