Using the techniques explained in this article, I created the following graphical representations of the Citrix Resource Manager Summary Database.

Microsoft Visio Drawing of the Citrix Resource Manager Summary Database
Don't have Microsoft Visio? No problem, just download a picture of the drawing here:
JPEG of the Citrix Resource Manager Summary Database (1770 x 1212) - (800 x 600)
-OR-Use the interactive pan and zoom web page here: (Note: requires IE 5.0 or above).
Interactive Pan and Zoom web page for the Citrix Resource Manager Summary Database