There are reasons on all sides that such a list is not available. Many firms don't want to publicize what they consider to be a competitive advantage, dealers (obviously) don't want to release their client list, and Graphisoft needs to respect these as well as be concerned about what its competitors would do with such information.
As Tom suggests, the best approach is the good, old, political standby of "press the flesh", virtually speaking of course.
You could of course post an ad but the first question that you have to answer is, "Why do you want to know?"
